单选题She ______ and fell from the top of the stairs to the bottom.A. slippedB. slopedC. splitD. spilt

单选题Being overweight increases a person's risk of heart disease, stroke, and high blood pressure. Studies have shown that high-protein diets help people lose weight who have not been able to lose weight in any other way. Therefore, high-protein diets can be an important part of a healthy lifestyle. Which of the following, if true, most undermines the conclusion expressed above about high-protein diets? A. High-protein diets have been linked to heightened rates of high cholesterol, stomach cancer, and kidney failure. B. High-protein diets are easier than conventional diets for most dieters to follow because they allow dieters to eat filling foods like meat and eggs. C. Although many dieters initially show rapid weight loss on high-protein diets, most of them regain the weight as soon as they go off the diet. D. Society should be more understanding of overweight people, and should not pressure them to pursue extreme diets. E. The high-protein diet fad has created a niche dieting industry that grosses over $2 billion per year.

单选题Everybody loves a fat pay rise. Yet pleasure at your own can vanish if you learn that a colleague has been given a bigger one. Indeed, if he has a reputation for slacking, you might even be outraged. Such behaviors is regarded as "all too human", with the underlying assumption that other animals would not be capable of this finely developed sense of grievance. But a study by Sarah Bronson and Franks de Wail of Emory University in Atlanta, Georgia, which has just been published in Nature, suggests that it is all too monkey, as well. The researchers studied the behaviors of female brown capuchin monkeys. They look cute. They are good-natured, co-operative creatures, and they share their food readily. Above all, like their female human counterparts, they tend to pay much closer attention to the value of "goods and services" than males. Such characteristics make them perfect candidates for Dr. Bronson’s and Dr. de Waal's study. The researchers spent two years teaching their monkeys to exchange tokens for food. Normally, the monkeys were happy enough to exchange pieces of rock for slices of cucumber. However, when two monkeys were placed in separate but adjoining chambers, so that each could observe what the other was getting in return for its rock, their behaviour became markedly different. In the world of capuchins grapes are luxury goods (and much preferable to cucumbers). So when one monkey was handed a grape in exchange for her token, the second was reluctant to hand hers over for a mere piece of cucumber. And if one received a grape without having to provide her token in exchange at all, the other either tossed her own token at the researcher or out of the chamber, or refused to accept the slice of cucumber. Indeed, the mere presence of a grape in the other chamber ( without an actual monkey to eat it) was enough to induce resentment in a female capuchin. The researchers suggest that capuchin monkeys, tike humans, are guided by social emotions. In the wild, they are a co-operative, group-living species. Such co-operation is likely to be stable only when each animal feels it is not being cheated. Feelings of righteous indignation, it seems, are not the preserve of people alone. Refusing a lesser reward completely makes these feelings abundantly clear to other members of the group. However, whether such a sense of fairness evolved independently in capuchins and humans, or whether it stems from the common ancestor that the species had 35 million years ago, is, as yet, an unanswered question.

单选题It ______ nearly every day here this month.

单选题______ of them knows much English.

单选题When children seriously disagree with their parents, experts suggest that parents should ______.

单选题 There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably came about just to five children something to do. In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world. What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same, The changes have ,been mostly in terms of craftsman-ship, mechanics, and technology. It is the universality of toys with regard to their development in all part of the world and their persistence to the present that is amazing. In Egypt, the Americas, China., Japan and. among the Arctic (北极的) peoples; generally: the same kinds of toys appeared. Variations depended on local customs and ways of life because toys imitate their surroundings. Nearly every civilization had dolls, little weapons, toy soldiers , tiny animals and vehicles. Because toys can be generally regarded as a kind of art form, they have not been subject to technological leaps that characterize inventions for adult use. The progress from the wheel to the oxcart to the automobile is a direct line of ascent (进步). The progress from a rattle (波浪鼓) used by a baby in 3000 BC to one used by an infant today, however, is not characterized by inventiveness. Each rattle is the product of the artistic tastes of the times and subject to the limitations of available materials.

单选题At the fall 2001 Social Science History Association convention in Chicago, the Crime and Justice network sponsored a forum on the history of gun ownership, gun use, and gun violence in the United States. Our purpose was to consider how social science history might contribute to the public debate over gun control and gun rights. To date, we have had little impact on that debate. It has been dominated by mainstream social scientists and historians, especially scholars such as Gary Kleck, John Lott, and Michael Bellesiles, whose work, despite profound flaws, is politically congenial to either opponents or proponents of gun control. Kleck and Mark Gertz, for instance, argue on the basis of their widely cited survey that gun owners prevent numerous crimes each year in the United States by using firearms to defend themselves and their property. If their survey respondents are to be believed, American gun owners shot 100, 000 criminals in 1994 in self-defense — a preposterous number. Lott claims on the basis of his statistical analysis of recent crime rates that laws allowing private individuals to carry concealed firearms deter murders, rapes, and robberies, because criminals are afraid to attack potentially armed victims. However, he biases his results by confining his analysis to the year between 1977 and 1992, when violent crime rates had peaked and varied little from year to year. He reports only regression models that support his thesis and neglects to mention that each of those models find a positive relationship between violent crime and real income, and an inverse relationship between violent crime and unemployment. Contrary to Kleck and Lott, Bellesiles insists that guns and America's "gun culture" are responsible for America's high rates of murder. In Belleville's opinion, relatively few Americans owned guns before the 1850s or know how to use, maintain, or repair them. As a result, he says, guns contributed little to the homicide rate, especially among white, which was low everywhere, even in the South and on the frontier, where historians once assume guns and murder went hand in hand. According to Bellesiles, these patterns changed dramatically after the Mexican War and especially after the Civil War, when gun ownership became widespread and cultural changes encouraged the use of handguns to command respect and resolve personal and political disputes. The result was an unprecedented wave of gun-related homicides that never truly abated. To this day, the United States has the highest homicide rate of any industrial democracy. Belleville's low estimates of gun ownership in early America conflict, however, with those of every historian who has previously studied the subject and have thus far proven irreproducible. Every homicide statistic he presents is either misleading or wrong. Given the influence of Kleck, kott, Bellesiles and other partisan scholars on the debate over gun control and gun rights, we felt a need to pull together what social science historians have learned to date about the history of gun ownership and gun violence in America, and to consider what research methods and projects might increase our knowledge in the near future.

单选题Tom sings better than ______ in our class.A. any other girlB. some other girlsC. any girlD. some girl

单选题The differences lie in the following except ______ of the parts.

单选题If ______, the experiment will be successful.A. carefully doingB. it done carefullyC. carefully doneD. doing carefully

单选题In Germany, the industrial giants Daimler Chrysler and Siemens recently ______ their unions into signing contracts that lengthen word hours without increasing pay.(2006年北京大学考博试题)

单选题Will the European Union make it? The question would have sounded strange not long ago. Now even the project"s greatest cheerleaders talk of a continent facing a "Bermuda triangle" of debt, population decline and lower growth. As well as those chronic problems, the EU faces an acute crisis in its economic core, the 16 countries that use the single currency. Markets have lost faith that the euro zone"s economies, weaker or stronger, will one day converge thanks to the discipline of sharing a single currency, which denies uncompetitive members the quick fix of devaluation. Yet, the debate about how to save Europe"s single currency from disintegration is stuck. It is stuck because the euro zone"s dominant powers, France and Germany, agree on the need for greater harmonization within the euro zone, but disagree about what to harmonize. Germany thinks the euro must be saved by stricter rules on borrowing, spending and competitiveness, backed by quasi-automatic sanctions for governments that do not obey. These might include threats to freeze EU funds for poorer regions and EU mega-projects, and even the suspension of a country"s voting rights in EU ministerial councils. It insists that economic co-ordination should involve all 27 members of the EU club, among whom there is a small majority for free-market liberalism and economic rigor; in the inner core alone, Germany fears, a small majority favour French interference. A "southern" camp headed by France wants something different: "European economic government" within an inner core of euro-zone members. Translated, that means politicians intervening in monetary policy and a system of redistribution from richer to poorer members, via cheaper borrowing for governments through common Eurobonds or complete fiscal transfers. Finally, figures close to the French government have murmured, euro-zone members should agree to some fiscal and social harmonization: e.g. curbing competition in corporate-tax rates or labour costs. It is too soon to write off the EU. It remains the world"s largest trading block. At its best, the European project is remarkably liberal: built around a single market of 27 rich and poor countries, its internal borders are far more open to goods, capital and labour than any comparable trading area. It is an ambitious attempt to blunt the sharpest edges of globalization, and make capital benign.

单选题Since their realization depends on the cooperation of others, they will take some convincing steps to come round to the agent's point of view.

单选题The ______ goal of the book is to help bridge the gap between research and teaching, particularly the gap between researchers and teachers.A. jointB. intensiveC. overallD. decisive