单选题Since the Great Depression, the United States government has protected farmers from damaging drops in grain prices.

单选题Find Yourself Packing It On? Blame Friends Obesity can spread from person to person, much like a virus, researchers are reporting today. When one person gains weight, close friends tend to gain weight, too. Their study, published in The New England Journal of Medicine, involved a detailed analysis of a large social network of 12,067 people who had been closely followed for 32 years, from 1971 to 2003. The investigators knew who was friends with whom as well as who was a spouse or sibling or neighbor, and they knew how much each person weighed at various times over three decades. That let them reconstruct what happened over the years as individuals became obese. Did their friends also become obese? Did family members? Or neighbors? The answer, the researchers report, was that people were most likely to become obese when a friend became obese. That increased a person's chances of becoming obese by 57 percent. There was no effect when a neighbor gained or lost weight, however, and family members had less influence than friends. It did not even matter if the friend was hundreds of miles away, the influence remained. And the greatest influence of all was between close mutual friends. There, if one became obese, the other had a 171 percent increased chance of becoming obese, too. The same effect seemed to occur for weight loss, the investigators say. But since most people were gaining, not losing, over the 32 years, the result was, on average, that people grew fatter. Dr. Nicholas A. Christakis, a physician and professor of medical sociology at Harvard Medical School and a principal investigator in the new study, said one explanation was that friends affected each others' perception of fatness. When a close friend becomes obese, obesity may not look so bad. "You change your idea of what is an acceptable body type by looking at the people around you," Dr. Christakis said. The investigators say their findings can help explain why Americans have become fatter in recent years--each person who became obese was likely to drag along some friends. Their analysis was unique, Dr. Christakis said, because it moved beyond a simple analysis of one person and his or her social contacts and instead examined an entire social network at once, looking at how a person's friend's friends, or a spouse's sibling's friends, could have an influence on a person's weight. The effects, he said, "highlight the importance of a spreading process, a kind of social contagion, that spreads through the network." Of course, the investigators say, social networks are not the only factors that affect body weight. There is a strong genetic component at work, too. Science has shown that individuals have genetically determined ranges of weights, spanning perhaps 30 or so pounds for each person. But that leaves a large role for the environment in determining whether a person's weight is near the top of his or her range or near the bottom. As people have gotten fatter, it appears that many are edging toward the top of their ranges. The question has been why. If the new research is correct, it may say that something in the environment seeded what some call an obesity epidemic, making a few people gain weight. Then social networks let the obesity spread rapidly.

单选题I grabbed his arm and made him turn to look at me.

单选题A lamp was suspended from the ceiling.______

单选题Why didn't Madoff have to go on trial?

单选题If you want to start a business, it is essential for you to raise more capitals.A. moneyB. investmentsC. savingsD. income

单选题He has trouble understanding that other people judge him by his social skills and conduct .

单选题The dentist has decided to take out the girl"s bad tooth.

单选题We are sure that he will get over his illness.

单选题He inspired many young people to take up the sportA. encouragedB. allowedC. calledD. advised

单选题I {{U}}propose{{/U}} that we discuss this at the next meeting．

单选题Laser beams can be used to bore metals and other hard materials.

单选题“There is no other choice,” she said in a （harsh） voice.

单选题When a liquid boils,it becomes a gas.

单选题I have been trying to quit smoking.

单选题The League of Women Voters is a nonpartisan organization that promotes informed active public participation in government.A. amateurB. organizedC. educatedD. dedicated

单选题If we leave now，we should miss the traffic． A．direct B．stop C．mix D．avoid

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从 4个选项中选杆1个最佳答案。 {{B}} Something Men Do Not Like to Do{{/B}} Eric Brown hates shopping. "It's just not enjoyable to me," said the 28-year-old Chicago man who was carrying several shopping bags along the city's main street, Michigan Avenue. "When I'm out{{U}} (51) {{/U}}, I basically know what I want to get. I rush in. I buy it. I{{U}} (52) {{/U}}." Common wisdom says that guys hate to shop. You can ask generations of men. But people who study shopping say that a number of social, cultural and economic factors are now{{U}} (53) {{/U}}this "men-hate-to-shop" notion. {{U}} (54) {{/U}}social class and age, men say they hate to shop," says Sharon Zukin, a City University of New York sociology professor. "Yet when you ask them deeper questions, it turns out that they{{U}} (55) {{/U}}to shop. Men generally like to shop for{{U}} (56) {{/U}}, music and hardware (硬件). But if you ask them about the shopping they do for books or music, they'll say, 'Well, that's not shopping. That's{{U}} (57) {{/U}}" In other words, what men and women call "buying things" and how they approach that task are{{U}} (58) {{/U}}. Women will{{U}} (59) {{/U}}through several 1,000-square-metre stores in search of the perfect party dress. Men will wander through 100 Internet sites in search of the{{U}} (60) {{/U}}digital camcorder (摄像放像机). Women see shopping as a social event. Men see it as a mission or A.{{U}} (61) {{/U}}to be won. "Men are frequently shopping to win," says Mary Ann McGrath, a marketing professor at Loyola University of Chicago. "They want to get the best deal. They want to get the best one, the last one and if they do that it{{U}} (62) {{/U}}them happy." When women shop, "they're doing it in a way where they want{{U}} (63) {{/U}}to be very happy," says McGrath. "They're kind of shopping for love." In fact, it is in clothing where we see a male-female{{U}} (64) {{/U}}most clearly. Why, complain some men, are all male clothes navy, black or brown? But would they wear light green and pink (粉红色的)? These days, many guys wear a sort of "uniform", says Pace Underhill, author of "Why We Buy". "It's been hard for them to understand what it means to be fashion-conscious (时尚) in a business way. It becomes much, much easier{{U}} (65) {{/U}}you narrow your range of choices."

单选题Since ancient times people have found various ways to preserve meat.

单选题Three world-class tennis players came to contend for this title.