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阅读下面的短文。每篇短文的后面有五个问题，每个问题有四个备选答案。请根据短文的内容选择最佳答案。每个试题计3分,共计15分 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.1 That let them reconstruct2 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 persons chances of becoming obese by 57 percent. 3 There was no effect when a neighbor gained or lost weight4，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. 5And 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. | 
