MySpace and other Web sites have unleashed a potent new phenomenon of social networking in cyberspace ,【B1】______at the same tim

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问题     MySpace and other Web sites have unleashed a potent new phenomenon of social networking in cyberspace ,【B1】______at the same time, a growing body of evidence is suggesting that traditional social【B2】______play a surprisingly powerful and under-recognized role in influencing how people behave.
    The latest research comes from Dr. Nicholas A. Christakis, at the Harvard Medical School, and Dr. James H. Fowler, at the University of California at San Diego. The【B3】______reported last summer that obesity appeared to【B4】______from one person to another【B5】______social networks, almost like a virus or a fad. In a follow-up to that provocative research, the team has produced【B6】______findings about another major health【B7】______; smoking. In a study published last week in the New England Journal of Medicine, the team found that a person’s decision to【B8】______the habit is strongly affected by【B9】______other people in their social network quit — even people they do not know. And, surprisingly, entire networks of smokers appear to quit virtually【B10】______
    For【B11】______of their studies, they【B12】______of detailed records kept between 1971 and 2003 about 5,124 people who participated in the landmark Framingham Heart Study. Because many of the subjects had ties to the Boston suburb of Framingham, many of the participants were【B13】______somehow—through spouses, neighbors, friends, co-workers—enabling the researchers to study a network that【B14】______12,067 people.
    Taken together, these studies are【B15】______a growing recognition that many behaviors are【B16】______by social networks in【B17】______that have not been fully understood. And【B18】______may be possible, the researchers say, to harness the power of these networks for many【B19】______, such as encouraging safe sex, getting more people to exercise or even【B20】______crime.
【B9】

选项 A、how
B、that
C、what
D、whether

答案D

解析 本题要求考生判断空格前后两个分句的逻辑关系,填入恰当的从句引导词。空格前有介词by,表明后面的从句为宾语从句,四个选项均可引导宾语从句。本句意思是“人们戒烟的决定被……影响”,即人们的戒烟行为受到交际圈他人行为的影响。“戒”或“不戒”,取决于交际圈的状况,即交际圈里的其他人戒烟还是不戒烟,因此这个宾语从句应含有选择关系,因此选项[D]whether正确。
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