单选题As all schoolchildren know, water freezes to solid, barren, cracked ice at 32 degrees Fahrenheit. So maybe it is more than a mere coincidence that 32 percent of U.S. public and private-school students in the class of 2011 are deemed proficient in mathematics, placing the United States 32nd among the 65 nations that participated in the latest international tests administered by the Organization for Economic Cooperation and Development (OECD). President Obama, to his credit, has highlighted the problem repeatedly. But too many state education officials have done their best to conceal the low performance of their students. Under the educational accountability rules set down by the federal law No Child Left Behind, each state may set its own proficiency standard, and most have set their standards well below the world-class level. As a result, most state proficiency reports grossly inflate the percentage of students who are proficient, if we account for the fact that our students need to compete not just with others from the same state but also with those across the globe. When not complicating the problem, apologists explain away the depressing results with misleading arguments. Some point to the country"s large immigrant and disadvantaged populations, which, to be sure, do pose difficult educational challenges. Proficiency rates among African-Americans and Hispanics are very low. But if one compares only the white students in the U.S. with all students in other countries, the U.S. still falls short. Some also take false comfort in the belief that it takes only a limited number of high-flying students to fill the jobs at Google, Facebook, IBM, and all the other businesses and professions that need highly skilled talent. Still others say the low math scores are offset by a better record in reading. Admittedly the proficiency rate in only 10 countries is significantly higher than in the U.S. Nonetheless, the set of skills most needed for sustained growth in economic productivity—and the skills in shortest supply today—are those rooted in math competencies. It is easy for political leaders to shortsightedly put off considerations of effective school reform. The economic benefits from reform would not be felt immediately, as it takes time for an educated generation to become a productive workforce. But just as the continuing debt crisis, if not fixed, will escalate out of control only over the longer term, so the best available solution to that crisis—a fully unfrozen, high-functioning, constantly improving educational system—could raise the level of human capital to the point where resources would be available to address much of this future debt crisis. In the simplest terms, the impending fiscal crises with Social Security and Medicare are most effectively dealt with by enhanced growth of the economy, growth that will not be achieved without a highly skilled workforce.

单选题Often called the intellectual leader of the animal-rights movement, Regan "is the foremost philosopher in this country in the field of the moral status of nonrational animals," says Bryan. Regan has lectured from Stockholm to Melbourne about the importance of recognizing animals as part of the evolving field of ethics. His books are widely acknowledged as having cemented the roots of the modern animal rights movement in academia. To be sure, vegetarianism dates back to Plato and Plutarch. But society viewed animals largely as properties, until Regan and a handful of other philosophers pushed animal-rights issues into the academic mainstream. Indeed, this academic focus has dramatically altered how Americans approach the ethics of husbandry, some observers say. Once-radical ideas have been firmly woven into society. Regan envisions a type of "bill of rights" for animals, including the abandonment of pet ownership, elimination of a meat-based diet, and new standards for biomedical research on animals. Essentially, he wants to establish a new kind of solidarity with animals, and stop animal husbandry altogether. "In addition to the visible achievements and changes, there"s been what I might call an invisible revolution taking place, and that revolution is the seriousness with which the issue of animal rights is taken in the academy and in higher education," Regan says. But with Regan planning to retire in December, a growing number of farmers, doctors, and others are questioning the sustainability of his ideas. Increasingly, Americans who feel their rights have become secondary to animals" rights are speaking out against a wave of arson attacks on farmers and pies thrown in the faces of researchers. Radical groups, with sometimes-violent tactics, have been accused of scaring farmers away from speaking up for traditional agrarian values. Indeed, tensions are only rising between animal-rights activists and groups that have traditionally used the land with an eye toward animals" overall welfare, not their "right" to be happy or to live long lives. The controversy around Regan is heightened by the fact that he"s no pacifist. He says he believes it"s OK to break the law for a greater purpose. He calls it the "greater-evil doctrine," the idea that there"s moral hierarchy to crime. "I think that you can win in court, and that"s what I tell people," Regan says. The shift in the level of respect has been "seismic," he says. "Contrary to what a lot of people think, there really has been a recognition that there are some things that human beings should not be permitted to do to animals. Where the human heart has grown is in the recognition of what is to be prohibited."

单选题 Most people would not pay two cents for something worth one. But America's government spent $116m last year doing just that. The money-losing purchase was money itself: the penny, which has cost more than a cent to produce since 2006, due mainly to the price of zinc, the coin's primary ingredient. Steel is not much better, as Canada has learned. The government there recently ditched its steel-based penny. American politicians, while loth to take lessons from their northern neighbours, may have noticed. In an online forum on February 14th Barack Obama intimated that the penny was no longer {{U}}change{{/U}} he believes in. Fifty years ago a handful of pennies would buy a hamburger at McDonald's, but inflation means the coin won't even get you one French fry today. Relegated to jars and lost behind cushions, the penny is failing to perform its primary function: to facilitate commerce. Vending machines and parking meters don't accept it. Penny scourges note that fiddling with them adds some two seconds to each transaction, costing the economy many millions of dollars a year. Penny lovers and zinc-industry lobbyists counter that the coin's demise would cost consumers, as merchants would round prices up to the nearest nickel. Some economists disagree, suggesting that shop keepers might in fact round down in order to avoid moving from a price of, say, $9.99 to $10. Americans anyway seem willing to accept a fee for penny removal, as evidenced by the self-imposed cost of leaving them idle and the success of coin-counting machines, which take a cut when turning them into bills. Other countries have eliminated low-value coins with less-than-dire results, and indeed, so has America. In 1857 it ditched the half-cent, then worth nearly as much in real terms as today's dime. This has led some to suggest killing the nickel, which costs about ten cents to make, as well as the penny.

单选题In the US, poll after poll has shown a majority in favour of animal experimentation, even without statements about its value. Why is opinion in Britain so different? I think that there are two reasons. The first is the success of antivivisection campaigners in lampooning animal research as outdated, intentionally cruel, "bad" science, which achieves nothing. All drugs and procedures developed with the help of animal tests are said to be dangerous. The occasional failure of animal testing to identify a dangerous drug is deployed as an argument for abandoning safety tests involving animals altogether—with no mention of the terrible human suffering that this would cause. They say that "alternative" methods already exist for all animal experiments, but the fact is that the law specifically forbids animal use if there is any alternative. The second reason is that scientists and doctors have failed to oppose such misrepresentation. In the early 1990s, animal rights campaigning in the US was met with much more forthright defence, not only by the major scientific societies, funding agencies and medical organisations, but also by the US government. To be positive, there are many encouraging features of the New Scientist poll. Interestingly, the public seems to employ the same kind of utilitarian philosophy that underpins the law in Britain—weighing potential benefits against the species involved (thus, monkeys are more "valuable" than mice) and the likelihood of suffering. Clearly, people in Britain do not recognise the essential link between animal research and testing and the medical treatments that they receive. Only 18 per cent of those who had taken (or had a close family member who had taken) a drug prescribed for a serious illness realized that the drug had been tested on animals, as all drugs are. Obviously, a large majority of those surveyed believe that they can happily benefit from medical treatment without taking advantage of animal research. No wonder so many people oppose it when asked the straight yes/no question. The views of the public must be respected. But this poll tells us that, while they are open to persuasion, their reaction is based on misunderstanding. The responsibility for providing honest evidence for the public ties not just with those who use animals in their research, but with other scientists who depend on that work. It lies with the doctors who benefit from animal research, with the pharmaceuticals and biotech industries, and the medical charities and funding agencies whose work would be crippled without it. But most of all, responsibility rests with government, which should cultivate serious and transparent debate between those of different opinion, and provide the public—especially young people—with the honest evidence they need and deserve.

单选题Our culture has caused most Americans to assume not only that our language is universal but that the gestures we use are understood by everyone. We do not realize that waving good-bye is the way to summon a person from the Philippines to one"s side, or that in Italy and some Latin-American countries, curling the finger to oneself is a sign of farewell. Those private citizens who sent packages to our troops occupying Germany after World War Ⅱ and marked them GIFT to escape duty payments did not bother to find out that "Gift" means poison in German. Moreover, we like to think of ourselves as friendly, yet we prefer to be at least 3 feet or an arm"s length away from others. Latins and Middle Easterners like to come closer and touch, which makes Americans uncomfortable. Our linguistic and cultural blindness and the casualness with which we take notice of the developed tastes, gestures, customs and languages of other countries, are losing us friends, business and respect in the world. Even here in the United States, we make few concessions to the needs of foreign visitors. There are no information signs in four languages on our public buildings or monuments; we do not have multilingual guided tours. Very few restaurant menus have translations, and multilingual waiters, bank clerks and policemen are rare. Our transportation systems have maps in English only and often we ourselves have difficulty understanding them. When we go abroad, we tend to cluster in hotels and restaurants where English is spoken. The attitudes and information we pick up are conditioned by those natives—usually the richer—who speak English. Our business dealings, as well as the nation"s diplomacy, are conducted through interpreters. For many years, America and Americans could get by with cultural blindness and linguistic ignorance. After all, America was the most powerful country of the free world, the distributor of needed funds and goods. But all that is past. American dollars no longer buy all good things, and we are slowly beginning to realize that our proper role in the world is changing. A 1979 Harris poll reported that 55 percent of Americans want this country to play a more significant role in world affairs; we want to have a hand in the important decisions of the next century, even though it may not always be the upper hand.

单选题Sign has become a scientific hot button. Only in the past 20 years have specialists in language study realized that signed languages are unique—a speech of the hand. They offer a new way to probe how the brain generates and understands language, and throw new light on an old scientific controversy: whether language, complete with grammar, is something that we are born with, or whether it is a learned behavior. The current interest in sign language has roots in the pioneering work of one rebel teacher at Gallaudet University in Washington, D.C., the world"s only liberal arts university for deaf people. When Bill Stokoe went to Gallaudet to teach English, the school enrolled him in a course in signing. But Stokoe noticed something odd: among themselves, students signed differently from his classroom teacher. Stokoe had been taught a sort of gestural code, each movement of the hands representing a word in English. At the time, American Sign Language (ASL) was thought to be no more than a form of pidgin English. But Stokoe believed the "hand talk" his students used looked richer. He wondered: Might deaf people actually have a genuine language? And could that language be unlike any other on Earth? It was 1955, when even deaf people dismissed their signing as "substandard". Stokoe"s idea was academic heresy. It is 37 years later. Stokoe—now devoting his time to writing and editing books and journals and to producing video materials on ASL and the deaf culture—is having lunch at a cafe near the Gallaudet campus and explaining how he started a revolution. For decades educators fought his idea that signed languages are natural languages like English, French and Japanese. They assumed language must be based on speech, the modulation of sound. But sign language is based on the movement of hands, the modulation of space. "What I said," Stokoe explains, "is that language is not mouth stuff—it"s brain stuff."

单选题The mental health movement in the United States began with a period of considerable enlightenment. Dorothea Dix was shocked to find the mentally ill in jails and almshouses and crusaded for the establishment of asylums in which people could receive humane care in hospital-like environments and treatment which might help restore them to sanity. By the mid 1800s, 20 states had established asylums, but during the late 1800s and early 1900s, in the face of economic depression, legislatures were unable to appropriate sufficient funds for decent care. Asylums became overcrowded and prison-like. Additionally, patients were more resistant to treatment than the pioneers in the mental health field had anticipated, and security and restraint were needed to protect patients and others. Mental institutions became frightening and depressing places in which the rights of patients were all but forgotten. These conditions continued until after World War Ⅱ. At that time, new treatments were discovered for some major mental illnesses theretofore considered untreatable, and newspaper reports called attention to the plight of the mentally ill. Improvements were made and Dr. David Vail"s Humane Practices Program is a beacon for today. But changes were slow in coming until the early 1960s. At that time, the Civil Rights movement led lawyers to investigate America"s prisons, which were disproportionately populated by blacks, and they in turn followed prisoners into the only institutions that were worse than the prisons—the hospitals for the criminally insane. The prisons were filled with angry young men who, encouraged by legal support, were quick to demand their rights. The hospitals for the criminally insane, by contrast, were populated with people who were considered "crazy" and who were often kept obediently in their place through the use of severe bodily restraints and large doses of major tranquilizers. The young cadre of public interest lawyers liked their role in the mental hospitals. The lawyers found a population that was both passive and easy to champion. These were, after all, people who, unlike criminals, had done nothing wrong. And in many states, they were being kept in horrendous institutions, an injustice, which, once exposed, was bound to shock the public and, particularly, the judicial conscience. Patients" rights groups successfully encouraged reform by lobbying in state legislatures. Judicial interventions have had some definite positive effects, but there is growing awareness that courts cannot provide the standards and review mechanisms that assure good patient care. The details of providing day-to-day care simply cannot be mandated by a court, so it is time to take from the courts the responsibility for delivery of mental health care and assurance of patient rights and return it to the state mental health administrators to whom the mandate was originally given. Though it is a difficult task, administrators must undertake to write rules and standards and to provide the training and surveillance to assure that treatment is given and patient rights are respected.

单选题The liberal view of democratic citizenship that developed in the 17th and 18th centuries was fundamentally different from that of the classical Greeks. The pursuit of private interests with as little interference as possible from government was seen as the road to human happiness and progress rather than the public obligations and involvement in the collective community that were emphasized by the Greeks. Freedom was to be realized by limiting the scope of governmental activity and political obligation and not through immersion in the collective life of the polis. The basic role of the citizen was to select governmental leaders and keep the powers and scope of public authority in check. On the liberal view, the rights of citizens against the state were the focus of special emphasis. Over time, the liberal democratic notion of citizenship developed in two directions. First, there was a movement to increase the proportion of members of society who were eligible to participate as citizens especially through extending the right of suffrage—and to ensure the basic political equality of all. Second, there was a broadening of the legitimate activities of government and a use of governmental power to redress imbalances in social and economic life. Political citizenship became an instrument through which groups and classes with sufficient numbers of votes could use the state power to enhance their social and economic well-being. Within the general liberal view of democratic citizenship, tensions have developed over the degree to which government can and should be used as an instrument for promoting happiness and well-being. Political philosopher Martin Diamond has categorized two views of democracy as follows. On the one hand, there is the "libertarian" perspective that stresses the private pursuit of happiness and emphasizes the necessity for restraint on government and protection of individual liberties. On the other hand, there is the "majoritarian" view that emphasizes the "task of the government to uplift and aid the common man against the malefactors of great wealth." The tensions between these two views are very evident today. Taxpayer revolts and calls for smaller government and less government regulation clash with demands for greater government involvement in economic marketplace and the social sphere.

单选题Fear seems to be the dominant mood of the moment. Hurricanes, tidal waves, floods, earthquakes and terrorism this year have all brought with them not only appalling scenes of devastation, death and suffering, but also outrage at the lack of preparations to avoid or cope with these disasters. Now even the birds of the air are a threat, we are told. That migrating flock visible on the horizon at sunset, once a consoling reminder of the eternal rhythms of nature, could be carrying the virus which might soon kill tens of millions of people. Given the many fingers pointed at governments in the wake of other disasters this year, it is hardly surprising that they are scrambling to respond to the threat posed by avian influenza. After confirmation this week that the H5N1 strain of bird flu, which has been spreading quickly in Asia, had been discovered in Romania and perhaps Greece, European Union foreign ministers convened an emergency meeting. President George Bush, still smarting from a torrent of criticism of his government"s clumsy response to Hurricane Katrina, has promised to rush out emergency plans for dealing with an outbreak of pandemic flu which have been stalled for years. Countries around the world are hurrying to stockpile the only current antiviral drug, Tamiflu, which might be effective in saving lives in any pandemic or curbing its spread. The World Health Organisation is calling for an internationally co-ordinated effort. Health ministers from around the globe are due to meet next week in Canada to discuss what steps to take. Is any of this effort justified? Or are politicians simply helping to feed public panic, and then covering themselves by promising to spend lavishly against a threat which may never materialize and to reduce a risk which they do not understand? To ask these questions is not to counsel complacency, but to apply the kind of test which is required in any kind of disaster planning, not least because the world is an inherently dangerous place and it is impossible to plan against every possible disaster. With the media full of warnings of impending mass death, an overreaction is all too possible.

单选题European countries are confronted by two global forces: atmospheric pressures that, as it were, change the weather, silently transforming societies and the assumptions of public policy. One is climate change. The other is demography. The two have a lot in common. Both are easily recognised but less easily understood. Both are products of complex forces and inconspicuous influences. Both create huge effects from tiny and gradual changes. A rise in global temperature by one degree or a fall in fertility by one point may sound trivial but, over 100 years, will make the earth unbearably hot, or reshape the size and composition of societies. It would be too much to say Europe"s population is back on the rise. But its long-term decline is starting to bottom out, and is even rising in a few places. On its face, this seems an odd assertion. In 1957, every one of the 27 countries that are now EU members had fertility rates above 2.1. Now, none does. 2.1 is the replacement level, the point at which the population stabilises. Received opinion holds that "demography is destiny". American observers from Walter Laqueur, an academic, to Mark Steyn, a conservative thinker, argue that Europe is fast becoming a barren, ageing, enfeebled place. The combination of low fertility, longer life and mass immigration will put intolerable pressure on public health, pensions and social services, leading (probably) to upheaval. There are several possible objections to that gloomy forecast. One is that a growing population is not, of itself, necessarily a good thing, nor a falling one unambiguously bad. Another is that there is no short-term correlation between population change and wealth: Japan and South Korea have even lower fertility than Europe. But there is a simpler objection: the picture of relentless decline is wrong, or, to be accurate, half wrong. Europe is not in decline. Rather, as Jitka Rychtarikova of the Charles University in Prague argues, it no longer makes sense to talk about Europe as a single demographic unit at all. There are two Europes. One is the familiar place of low fertility and population decline. The low fertility belt runs from the Mediterranean to central and eastern Europe, embracing both old and new parts of the continent. The other, surprising Europe is a place of recovering fertility and rising population. It stretches from Scandinavia to France. Here, countries have escaped the fertility trap and the childbearing rate is around 1.8—not high, but higher than it was, and, in some cases, reaching the magic replacement level. Europeans are only starting the process of recovery. Compared with America, even the growing parts of the continent have modest fertility rates and high dependency ratios. But if Europe has a demographic future it lies in Britain, France and Scandinavia, not across the Atlantic.

单选题There is nothing like a good bidding war to lift capitalism"s spirits. And that may be exactly what is about to happen after Kraft made a $17 billion bid for Cadbury on September 7th. The well-known British confectioner straightly rejected the American food giant"s offer, saying it "fundamentally undervalues" the company, which could continue to thrive on its own. Kraft"s move is one of several in recent days that have raised hopes of a new wave of mergers and acquisitions just as it seemed, after a summer of inactivity, that 2009 would be a declining year for M&A. On September 8th Deutsche Telekom and France Telecom said they would merge their British mobile-phone operations, respectively T-Mobile and Orange, to create a new market leader. On August 31st Disney bought superhero factory Marvel Entertainment for $4 billion, and Baker Hughes offered $5.5 billion for its fellow Houston-based energy-services firm, BJ Services. Perhaps this will prove to be nothing more than a dead-cat bounce, a brief increase of long-overdue deals that were held back until senior executives and investment bankers returned from the beach. After all, dealmaking had fallen to unnaturally low levels in the aftermath of last year"s financial panic and subsequent economic slump, so a burst of post-summer action was always a possibility without it necessarily implying a turn in the cycle. Yet hopes are rising that the recent outbreak of deals might indicate a genuine turning point in the merger market. "While it is not yet evident in the statistics, the level of corporate dialogue has picked up recently," says Christopher Ventresca, co-head of North American M&A for JPMorgan. One reason is that many firms now think systemic risk in the financial system has fallen to a low level. Another, he says, is that they have done the defensive work needed to ensure their earnings after last year"s panic., refinancing debt where necessary and making sure that they have plenty of what the crisis revealed as the possible difference between corporate life and death—financial liquidity. With that sorted out—thanks, not least, to a dramatic reopening of the debt markets, at least for more creditworthy companies—managers are trying to figure out how to expand their businesses in what forecasts suggest will remain a gloomy economy for years, at least in rich countries. Buying growth from outside, rather than generating it organically, may be the easiest option. There is also a momentum effect in M&A, especially as the cycle turns. "Seeing some well-known firms start to do deals will create more confidence in others," says Mr Ventresca. Share prices are also now in a sweet spot for a revival of deals, says David Bianco, a strategist at Bank of America Merrill Lynch. They have increased decisively enough to inspire confidence that the worst is over, yet valuations are still depressed by historic standards and when compared with past recoveries from financial crises. In other words, there are bargains to be had.

单选题Researchers who are unfamiliar with the cultural and ethnic groups they are studying must take extra precautions to shed any biases they bring with them from their own culture. For example, they must make sure they construct measures that are meaningful for each of the cultural or ethnic minority groups being studied! In conducting research on cultural and ethnic minority issues, investigators distinguish between the emic approach and the etic approach. In the emic approach, the goal is to describe behavior in one culture or ethnic group in terms that are meaningful and important to the people in that culture or ethnic group, without regard to other cultures or ethnic groups. In the etic approach, the goal is to describe behavior so that generalizations can be made across cultures. If researchers construct a questionnaire in an emic fashion, their concern is only that the questions are meaningful to the particular culture or ethnic group being studied. If, however, the researchers construct a questionnaire in an etic fashion, they want to include questions that reflect concepts familiar to all cultures involved. How might the emic and etic approaches be reflected in the study of family processes? In the emic approach, the researchers might choose to focus only on middle-class White families, without regard for whether the information obtained in the study can be generalized or is appropriate for ethnic minority groups. In a subsequent study, the researchers may decide to adopt an etic approach by studying not only middle-class White families, but also lower-income White families, Black American families, Spanish American families, and Asian American families. In studying ethnic minority families, the researchers would likely discover that the extended family is more frequently a support system in ethnic minority families than in White American families. If so, the emic approach would reveal a different pattern of family interaction than would the etic approach, documenting that research with middle-class White families cannot always be generalized to all ethnic groups.

单选题 We have known for a long time that the organization of any particular society is influenced by the definition of the sexes and the distinction drawn between them. But we have realized only recently that the identity of each sex is not so easy to pin down, and that definitions evolve in accordance with different types of culture known to us, that is, scientific discoveries and ideological revolutions. Our nature is not considered as unchangeable, either socially or biologically. As we approach the beginning of the 21 st century, the substantial progress made in biology and genetics is radically challenging the roles, responsibilities and specific characteristics attributed to each sex, and yet, scarcely twenty years ago, these were thought to be "beyond dispute". We can safely say, with a few minor exceptions, that the definition of the sexes and their respective functions remained unchanged in the West from the beginning of the 19th century to the 1960s. The role distinction lasted throughout this period, appealing for its justification to nature, religion and customs alleged to have existed since the dawn of time. The woman bore children and took care of the home. The man set out to conquer the world and was responsible for the survival of his family, by satisfying their needs in peacetime and going to war when necessary. The entire world order rested on the divergence of the sexes. Any overlapping or confusion between the roles was seen as a threat to the time-honored (由来已久的) order of things. It was felt to be against nature, a deviation from the norm. Sex roles were determined according to the "{{U}}place{{/U}}" appropriate to each. Women's place was, first and foremost, in the home. The outside world, i.e. workshops, factories and business firms, belonged to men. This sex-based division of the world (private and public) gave rise to a strict dichotomy (对立) between the attitudes, which conferred on each its special identity. The woman, sequestered at home, "cared, nurtured and conserved". To do this, she had no need to be daring, ambitious, tough or competitive. The man, on the other hand, competing with his fellow men, was caught up every day in the struggle for survival, and hence developed those characteristics which were thought natural in a man. Today, many women go out to work, and their reasons for doing so have changed considerably. Besides the traditional financial incentives, we find ambition and personal fulfillment motivating those in the most favorable circumstances, and the wish to have a social life and to get out of their domestic isolation influencing others. Above all, for all women, work is invariably connected with the desire for independence.

单选题For years, doctors advised their patients that the only thing taking multivitamins does is give them expensive urine. After all, true vitamin deficiencies are practically unheard of in industrialized countries. Now it seems those doctors may have been wrong. The results of a growing number of studies suggest that even a modest vitamin shortfall can be harmful to your health. Although proof of the benefits of multivitamins is still far from certain, the few dollars you spend on them is probably a good investment. Or at least that"s the argument put forward in the New England Journal of Medicine . Ideally, say Dr. Walter Willett and Dr. Meir Stampfer of Harvard, all vitamin supplements would be evaluated in scientifically rigorous clinical trials. But those studies can take a long time and often raise more questions than they answer. At some point, while researchers work on figuring out where the truth lies, it just makes sense to say the potential benefit outweighs the cost. The best evidence to date concerns folate, one of the B vitamins. It"s been proved to limit the number of defects in embryos, and a recent trial found that folate in combination with vitamin B12 and a form of t36 also decreases the re-blockage of arteries after surgical repair. The news on vitamin E has been more mixed. Healthy folks who take 400 international units daily for at least two years appear somewhat less likely to develop heart disease. But when doctors give vitamin E to patients who already have heart disease, the vitamin doesn"t seem to help. It may turn out that vitamin E plays a role in prevention but cannot undo serious damage. Despite vitamin C"s great popularity, consuming large amounts of it still has not been positively linked to any great benefit. The body quickly becomes saturated with C and simply excretes any excess. The multivitamins question boils down to this: Do you need to wait until all the evidence is in before you take them, or are you willing to accept that there"s enough evidence that they don"t hurt and could help? If the latter, there"s no need to go to extremes and buy the biggest horse pills or the most expensive bottles. Large doses can cause trouble, including excessive bleeding and nervous system problems. Multivitamins are no substitute for exercise and a balanced diet, of course. As long as you understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.

单选题 The differences in living standards around the world are vast. In 1993, the average American had an income of about ＄25,000. In the same year, the average Mexican earned ＄7,000, and the average Nigerian earned ＄1,500. Not surprisingly, this large variation in average income is reflected in various measures of the quality of life. Changes in living standards over time are also large. In the United States, incomes have historically grown about 2 percent per year (after adjusting for changes in the cost of living). At this rate, average income doubles every 35 years. In some countries, economic growth has been even more rapid. In Japan, for instance, average income has doubled in the past 20 years, and in South Korea it has doubled in the past 10 years. What explains these large differences in living standards among countries and over time? The answer is surprisingly simple. Almost all variation in living standards is attributable to differences in countries' productivity—that is, the amount of goods and services produced from each hour of a worker's time. In nations where workers can produce a large quantity of goods and services per unit of time, most people enjoy a high standard of living; in nations where workers are less productive, most people must endure a more meager existence. Similarly, the growth rate of a nation's productivity determines the growth rate of its average income. The fundamental relationship between productivity and living standards is simple, but its implications are far-reaching. If productivity is the primary determinant of living standards, other explanations must be of secondary importance. For example, people might think that labor unions or minimum-wage laws contributed to the rise in living standards of American workers over the past century. Yet the real hero of American workers is their rising productivity. The relationship between productivity and living standards also has great implications for public policy. When thinking about how any policy will affect living standards, the key question is how it will affect our ability to produce goods and services. To improve living standards, policymakers need to raise productivity by ensuring that workers are well educated, have the tools needed to produce goods and services, and have access to the best available technology.

单选题Menorca or Majorca? It is that time of the year again. The brochures are piling up in travel agents while newspapers and magazines bulge with advice about where to go. But the traditional packaged holiday, a British innovation that provided many timid natives with their first experience of warm sand, is not what it was. Indeed, the industry is anxiously awaiting a High Court ruling to find out exactly what it now is. Two things have changed the way Britons research and book their holidays: low-cost airlines and the Internet. Instead of buying a ready-made package consisting of a flight, hotel, car hire and assorted entertainment from a tour operator"s brochure, it is now easy to put together a trip using an online travel agent like Expedia or Travelocity, which last July bought Lastminute. corn for ￡577 million ($1 billion), or from the proliferating websites of airlines, hotels and car-rental firms. This has led some to sound the death knell for high-street travel agents and tour operators. There have been upheavals and closures, but the traditional firms are starting to fight back, in part by moving more of their business online. First Choice Holidays, for instance, saw its pre-tax profit rise by 16% to ￡114 million ($196 million) in the year to the end of October. Although the overall number of holidays booked has fallen, the company is concentrating on more valuable long-haul and adventure trips. First Choice now sells more than half its trips directly, either via the Internet, over the telephone or from its own travel shops. It wants that to reach 75% within a few years. Other tour operators are showing similar hustle. MyTravel managed to cut its loss by almost half in 2005. Thomas Cook and Thomson Holidays, now both German owned, are also bullish about the coming holiday season. High-street travel agents are having a tougher time, though, not least because many leading tour operations have cut the commissions they pay. Some high-street travel agents are also learning to live with the Internet, helping people book complicated trips that they have researched online, providing advice and tacking on other services. This is seen as a growth area. But if an agent puts together separate flights and hotel accommodation, is that a package, too? The Civil Aviation Authority (CAA) says it is and the agent should hold an Air Travel Organisers Licence, which provides financial guarantees to repatriate people and provide refunds. The scheme dates from the early 1970s, when some large British travel firms went bust, stranding customers on the Costas. Although such failures are less common these days, the CAA had to help out some 30,000 people last year. The Association of British Travel Agents went to the High Court in November to argue such bookings are not traditional packages and so do not require agents to acquire the costly licences. While the court decides, millions of Britons will happily click away buying online holidays, unaware of the difference.

单选题"This is a really exciting time—a new era is starting," says Peter Bazalgette, the chief creative officer of Endemol, the television company behind "Big Brother" and other popular shows. He is referring to the upsurge of interest in mobile television, a nascent industry at the intersection of telecoms and media which offers new opportunities to device-makers, content producers and mobile-network operators. And he is far from alone in his enthusiasm. Already, many mobile operators offer a selection of television channels or individual shows, which are "streamed" across their third-generation (3G) networks. In Korea, television is also sent to mobile phones via satellite and terrestrial broadcast networks, which is far more efficient than sending video across mobile networks; similar broadcasts will begin in Japan in April. In Europe, the Italian arm of 3, a mobile operator, recently acquired Canale 7, a television channel, with a view to launching mobile-TV broadcasts in Italy in the second half of 2006. Similar mobile-TV networks will also be built in Finland and America, and are being tested in many other countries. Meanwhile, Apple Computer, which launched a video-capable version of its iPod portable music-player in October, is striking deals with television networks to expand the range of shows that can be purchased for viewing on the device , including "Lost", "Desperate Housewives" and "Law & Order". TiVo, maker of the pioneering personal video recorder (PVR), says it plans to enable subscribers to download recorded shows on to iPods and other portable devices for viewing on the move. And mobile TV was one of the big trends at the world"s largest technology fair, the Consumer Electronics Show, which took place in Las Vegas this week. Despite all this activity, however, the prospects for mobile TV are unclear. For a start, nobody really knows if consumers will pay for it, though surveys suggest they like the idea. Informa, a consultancy, says there will be 125 million mobile-TV users by 2010. But many other mobile technologies inspired high hopes and then failed to live up to expectations. And even if people do want TV on the move, there is further uncertainty in three areas: technology, business models and the content itself.

单选题How fortuitous that the state budget will undoubtedly preclude the building of yet another state prison. Nebraska can ill afford another one. Oh, it"s not that the state could not promptly fill one; Nebraska seems quite adept at filling prisons. The "new" 960-bed prison at Tecumseh, opened in 2001, is already near capacity—and that was the facility designed to alleviate overcrowding elsewhere in the state system. Overall, the Nebraska state prison system is 33 percent above capacity. Nor is that figure likely to drop in the near future. The Department of Corrections estimates the prison system will be 40 percent above capacity by 2006 and 61 percent by 2008. That"s only five years away. No, there would be no problem filling yet another state prison were it built. Indeed, these statistics suggest that building more prisons might well be an unending cycle of build-fill, build-fill, build-fill. Something"s amiss. While arguments can rage indefinitely regarding the efficacy of prisons to deter or rehabilitate offenders, the fact remains that Nebraska prisons continue to fill rapidly—and often with repeat offenders. Equally susceptible to argument are questions surrounding inmates" rights, prison amenities and work privileges. But the fact remains that in five years, Nebraska"s prison population could exceed capacity by 61 percent. Thus a severely restricted state budget promises to prompt legislators to examine more closely the system as a whole. The nature of a crime, alternative sentencing and judicial discretion are all areas that impact the current prison dilemma. For instance, violent or nonviolent crimes often translate to maximum or minimum security prisons. However, if an evolving hierarchy-of sentencing existed—especially for nonviolent crimes—that might well lead to more frequent and consistent use of alternative sentencing. To some degree, such alternative sentencing options as electronic monitoring, home incarceration, work camps, drug court, intense rehabilitation programs and educational opportunities already exist in the state. They are potentially less costly though equally valid options to prison sentences. Yet not all judges use them. What does such random and inconsistent use of these alternatives say about the alternatives themselves and about judges" awareness of or commitment to such options? If the bigger goal is to reduce crime and teach offenders a lesson, building prisons and warehousing inmates falls woefully short. Senators and judges alike need to do more than complete surveys and consult think tanks. They need to find the will to alter the system.

单选题Over the past decade, many companies had perfected the art of creating automatic behaviors—habits—among consumers. These habits have helped companies earn billions of dollars when customers eat snacks or wipe counters almost without thinking, often in response to a carefully designed set of daily cues. "There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can"t figure out how to change people"s habits," said Dr. Curtis, the director of the Hygiene Center at the London School of Hygiene Tropical Medicine. "We wanted to learn from private industry how to create new behaviors that happen automatically." The companies that Dr. Curtis turned to—Procter & Gamble, Colgate-Palmolive and Unilever—had invested hundreds of millions of dollars finding the subtle cues in consumers" lives that corporations could use to introduce new routines. If you look hard enough, you"ll find that many of the products we use every day—chewing gums, skin moisturizers, disinfecting wipes, air fresheners, water purifiers, health snacks, teeth whiteners, fabric softeners, vitamins—are results of manufactured habits. A century ago, few people regularly brushed their teeth multiple times a day. Today, because of shrewd advertising and public health campaigns, many Americans habitually give their pearly whites a cavity-preventing scrub twice a day, often with Colgate, Crest or one of the other brands. A few decades ago, many people didn"t drink water outside of a meal. Then beverage companies started bottling the production of far-off springs, and now office workers unthinkingly sip bottled water all day long. Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breath freshener and teeth cleanser for use after a meal. Skin moisturizers are advertised as part of morning beauty rituals, slipped in between hair brushing and putting on makeup. "Our products succeed when they become part of daily or weekly patterns," said Carol Berning, a consumer psychologist who recently retired from Procter & Gamble, the company that sold $76 billion of Tide, Crest and other products last year. "Creating positive habits is a huge part of improving our consumers" lives, and it"s essential to making new products commercially viable." Through experiments and observation, social scientists like Dr. Berning have learned that there is power in tying certain behaviors to habitual cues through ruthless advertising. As this new science of habit has emerged, controversies have erupted when the tactics have been used to Sell questionable beauty creams or unhealthy foods.

单选题Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of urban travel in the foreseeable future. The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types. Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion. One proposed solution to this problem is the automated highway system. When the auto enters the highway system, a retractable arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the car will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car"s movements. The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wait for the buzzer that will warn him of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,500 to 2,000 vehicles that can be carried by a present-day highway.