单选题Scientists hope the collision will produce a large crater in the comet's surface in order to reveal the core and give some ______ to the origin of the solar system.

单选题The news reports completely overlooked the more profound political implications of the events.

单选题Some individuals have Uapplied/U "positive thinking" either to particular external circumstances or Uto/U some particular habits or character defects.

单选题The United Nations declared last Friday that Somalia's famine is over. But the official declaration means little to the millions of Somalis who are still hungry and waiting for their crops to grow. Ken Menkhaus, professor of political science at Davidson College, said it was profoundly disappointing to be discussing another Somali famine, after he worked in the country during the 1991 — 1992 one. Each famine, he said, has distinct characteristics, and this one unfold in slow motion over the past couple of years. That's at least partly because the Somali diaspora sent money home that delayed the worst effects. Menkhaus was among four experts on Somalia and famine who spoke at the Radcliffe Gym Monday evening. Who gathered for the event, "Sound the Horn: Famine in the Horn of Africa. " Paul Farmer, Kolokotrones University Professor of Global Health and Social Medicine, drew on his experience treating malnourished people in Haiti, where he has worked for decade, and said the human and social context of home, and aid to families should be part of wearing the child, he said. Similarly, broader agricultural interventions and fair trade policies are needed to boost local agricultural economies. Though famine is often thought of as a natural disaster, Monday's speakers said that is a false impression. Though Somalia suffered through a severe drought, with today's instant communications, transport systems can move massive amounts of food. Given today's global food markets, famine is too often a failure of local government and international response. "In today's 21st-century world, just about everything about famine is man-made. We're no longer in a world of man against nature. " said Robert Paarlberg, adjunct professor of public policy at the Harvard Kennedy School. Ethiopia, which was also affected by the recent drought, fared much better this time because of reforms implemented after the 2001 one. Likewise, Paarlberg said, northern and central Somalia, regions that fall outside of the influence of the Al-Shabaab militia, also fared better. There were several man-made features of this famine, which affected more than 10 million people and killed between 50, 000 and 100, 000, half of them children under age 5. The largest man-made feature was the role of the Al-Shabaab militia that rules the region and that kept food aid from reaching those in need. But the international community isn't blameless. As early as November 2010, an international famine early warning system was predicting the failure of rains in the region, but the international community didn't respond fully until an official famine was declared in July 2011. On top of that, U. S. anti-terrorism laws cut off food aid because Al-Shabaab, listed as a terrorist group, was taking some of it. Though the United Nations has declared the famine over, that was based on statistical measures, such as the number of people dying each day and the number of children who are malnourished. Though the official famine may be over, both U. N. officials and Monday's speakers said the crisis continues for the people of Somalia. Almost a third of the population remains dependent on humanitarian assistance, crops growing from recent rains will take months to reach maturity, and herds of cows, goats, and other animals were greatly reduced during the crisis. Michael Delaney, director of humanitarian response for Oxfam America, warned that the world will have another chance to get its response fight, because the warning signs are pointing to an impending famine in Africa's Sahel, the arid, continent-spanning transition zone just below the Sahara Desert.

单选题A corps of so-called barefoot doctors are trained in Uhygiene/U, preventive medicine, acupuncture, and routine treatment of common diseases.

单选题While admiring that this forecast was ______ uncertain, the scientists warned against treating it as a cry of wolf.

单选题The international Olympic Games, regarded as the world's most prestigious athletic competition, take place once every the four years.

单选题Largely due to the university tradition and the current academic milieu, every college student here works ______.

单选题What things in life are you most desirous ______ attaining?

单选题The first big-name hackers include Steve Wozniak, Bill Gates and Linus Torvalds, all now highly recognisable names behind many of the computer technologies used today. These early hackers had a love of technology and a compelling need to know how it all worked, and their goal was to push programs beyond what they were designed to do. Back then, the word "hacker" didn't have the negative connotation it has today. The original backer ethic, rooted out of simple curiosity and a need to be challenged, appears to be dead. The objectives of early hackers are a far cry from the goals of today's hacker. The motivation of the new breed of hackers appears not to be curiosity, or a hunger for knowledge, as it used to be. Instead, most of today's hackers are driven by greed, power, revenge, or some other malicious intent, treating hacking as a game or sport, employing the tools that are readily available via the Internet. The rate of security attacks is actually outpacing the growth of the Internet. This means that something besides the growth of the Internet is driving the rise in security attacks. Here are some realities you should know about: Operating systems and applications will never be secure. New vulnerabilities will-be introduced into your environment every day. Even if you ever do get one operating system secure, there will be new operating systems with new vulnerabilities—phones, wireless devices, and network appliances. Employees will never keep up with security polices and awareness. It doesn't matter how much you train and educate your employees. If your employees disregard warnings about the hazards of opening questionable email attachments, how are you going to educate them about properly configuring firewalls and intrusion detection systems for their PCs? Managers have more responsibility than ever. And on top of the realities listed above, security managers are being asked to support increasing degrees of network availability and access. There are some good security measures you can take: Employ a layer 7, full-inspection firewall. Automatically update your anti-virus at the gateway, server and client. Keep all of your systems and applications updated. Hackers commonly break into a Web site through known security holes, so make sure your servers and applications are patched and up to date. Turn off unnecessary network services. Eliminate all unneeded programs. Scan your network for common backdoor services, and use intrusion detection systems, vulnerability scans, and anti-virus protection.

单选题Drinking wastewater? The idea may sound distasteful, but new federally funded research says more Americans are doing so — whether they know or not — and this reuse will be increasingly necessary as the U. S. population expands. Treated wastewater poses no greater health risks than existing water supplies and, in some cases, may be even safer to drink, according to a report released by the National Research Council, " We believe water reuse is an option to deal with growing water scarcity, especially in coastal areas," says Jorg Drowes, an engineering professor at the Colorado School of Mines. "This can be done reliably without putting the public at risk," he says, citing technological advances. He says it's a waste not to reuse the nation's wastewater, because almost all of it is treated before discharge. This water includes storm runoff(径流)as well as used water from homes, businesses and factories. In many places, the report says, the public does not realize it's drinking water that was treated after being discharged as wastewater somewhere upstream. For example, wastewater discharged into the Trinity River from Dallas/Fort Worth flows south into Lake Livingston, the source for Houston's drinking water. Despite the growing importance of this reuse, the report says there's been no systemic analysis of its extent nationwide since a 1980 study by the U. S. Environmental Protection Agency(EPA). Alan Roberson of the American Water Works Association says wastewater reuse is common, so the council's report is important but not surprising. Roberson expects this recycling will continue to increase, especially for irrigation and industrial needs. He says it will take longer to establish potable(适于饮用的)uses because of public nervousness about drinking wastewater, however treated. "We have to do something to address water scarcity," says Olga Naidenko, a senior scientist at the non-profit Environmental Working Group. " Less than 10% of potable water is used for drinking, cooking, showering or dishwashing. We flush it down the toilet, literally. " Technologies exist to safely treat the water, she says, although some are expensive. The report says water reuse projects tend to cost more than most water conservation options but less than seawater desalination(脱盐)and other supply alternatives. It calls on the EPA to develop rules that set safe national standards.

单选题The position of Burleigh School in the English educational system would be very difficult to explain to a foreigner (who has, God knows, enough to contend with in comprehending the other parts of the system). Nor would it be possible to refer him to any works of literature (before the present one) from which he could gain enlightenment. The prep schools have had their Orwell, the public schools their Connolly and Benedictus, the convent schools their Antonia White, the private boarding schools their Waugh and Nicolas Blake. No one has thought it worth their while to eulogize or anathematize schools like Burleigh. Indeed, schools like Burleigh do not seem the sort of places from which writers emerge. And yet, any medium-sized town in the southern half of England has its Burleigh School: a private day school to which, for a not too exorbitant fee, parents can send their children and boast that they are privately educated. Not well educated, but privately. Burleigh itself had been founded--no, started--between the wars, had survived the Depression (as the South of England middle classes in general had so signally managed to coast blithely through the Depression) and had offered over the years an alternative to the Grammar, Secondary Modern and Technical Schools of the town of Cullbridge. Which meant, in effect, that though some parents chose to send their children there rather than to the Grammar School, many more sent them there because they failed their eleven-plus, that Beecher's Brook of English childhood. With the coming of comprehensive education three years before, even the faint whiff of privilege attached to the Grammar School had evaporated, a fact on which Burleigh had been able to capitalize, in a mild way. Foreigners are always apt to find charming the examples they come across of quaint anachronisms, of dated anomalies, in English life. One such charming and dated anomaly is that a school like Burleigh can be bought. A man--any man--can buy such a place, set himself up as headmaster, and run it as he likes. Indeed, that is precisely what Edward Crumwallis had done. He had bought it from its previous aging owner/headmaster in 1969, and had been there ever since. This must not be taken to imply that Edward Crumwallis was unfit for his position. He was in fact a BA (3rd class, Geography), from the University of Hull (graduated 1948). Still, scholarship was not exactly his thing. He might take the odd class in Geography in a pinch, but he had never given the subject any particular prominence in the school, and most boys gave it up after two years. Nor was Crumwallis anxious to take over periods in other subjects when there was need--as in cases of sickness or (frequently) death. Since his graduation he had not cultivated Learning. He had cultivated Manner. He had bought Burleigh (which he invariably called The Burleigh School, in capitals) precisely so that his manner might be given free reign and ample pasturage. A very good manner it was too, with parents-- decidedly impressive, ft certainly impressed those of limited intelligence, among whom may be numbered-Crumwallis himself. He really believed in it: he not only thought that others should remain silent during his threadbare pontifications, but he actually believed they would benefit from them. Such a conspicuous lack of self-knowledge had its dangers. Not that the Manner--which he intended should be so admired later in the week On Parents' Evening--was particularly in evidence on the Monday, as he sat at his study desk and went over the plans for that event with his wife. The side of Edward Crumwallis that was most evident during such t·te-·-·tes was the petty-minded, niggling side that his psychological profile seldom turned in the parents' direction. "The question is, shall we splurge on the coffee and scrimp on the tea, or vice versa," he said.

单选题Talks on climate change resumed in the German city of Bonn on July 16 to combat global warming.

单选题 Most of us find the forgetting easier, but maybe we should work on the forgiving part. "Holding on to hurts and nursing grudges wear you down physically and emotionally," says Stanford University psychologist Fred Luskin, author of Forgive for Good. "Forgiving someone can be a powerful antidote." In a recent study, Charlotte, assistant/associate professor of psychology at Hope College in Holland, Michigan; and this colleagues asked 71 volunteers to remember a past hurt. Tests recorded the highest blood pressure, heart rate and muscle tension—the same responses that occur when people are angry. Research has linked anger and heart disease. When the volunteers were asked to imagine empathizing, even forgiving those who had wronged them, they remained calm by comparison. What's more, forgiveness can be learned, insists Luskin, director of the Stanford Forgive- ness Project, "We teach people to rewrite their story in their minds, to change from victim to he- m. If the hurt is from a spouse's infidelity, we might encourage them to think of themselves not only as a person who was cheated on, but as the person who tried to keep the marriage together. Two years ago, Luskin tested his method on 5 Northern Irish women whose sons had been murdered. After undergoing a week of forgiveness training, the women's sense of hurt, measured using psychological tests, had fallen by more than half. They were also much less likely to feel depressed and angry. "Forgiving isn't about forgetting what happened," says Luskin. "It is about breaking free of the person who wronged us." The early signs that forgiving improves overall health are promising: A survey of 1,423 adults by the University of Michigan's Institute for Social Research in 2001 found that people who had forgiven someone in their past also reported being in better health than those who hadn't. However, while 75% said they were sure God had forgiven them for past mistakes, only52% had been able to find it in their hearts to forgive others. Forgiveness; it seems, is still divine.

单选题Most nurses are women, but in the higher ranks of the medical profession women are in a ______. [A] scarcity [B] minority [C] minimum [D] shortage

单选题The manufacturer was forced to return the money to the consumers under ______ of law. A. guideline B. definition C. constraint D. idetity

单选题Simon's letter was in such a casual scrawl, and in such pale ink, that it was ______. A. vague B. ambiguous C. illegible D. obscure

单选题Distance education is different from self-study in that it ______.

单选题Language, like food, is a basic human need without which a child at a critical period of life might be______ and damaged. (2004年武汉大学考博试题)

单选题The department store guards were nearly ______ by the crowds of shoppers waiting for the sale to begin. A. overflowed B. overthrown C. overturned D. overwhelmed