My Space and other Web sites have unleashed a potent new phenomenon of social networking in cyberspace, (1) at the same time, a growing body of evidence is suggesting that traditional social (2) 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 (3) reported last summer that obesity appeared to (4) from one person to another (5) social networks, almost like a virus or a fad. In a follow-up to that provocative research, the team has produced (6) findings about another major health (7) : smoking. In a study published last week in the New England Journal of Medicine, the team found that a person’s decision to (8) the habit is ply affected by (9) other people in their social network quit—even people they do not know. And, surprisingly, entire networks of smokers appear to quit virtually (10)
For (11) of their studies, they (12) 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, Mass. , many of the participants were (13) somehow—through spouses, neighbors, friends, co-workers—enabling the researchers to study a network that (14) 12,067 people.
Taken together, these studies are (15) a growing recognition that many behaviors are (16) by social networks in (17) that have not been fully understood. And (18) may be possible, the researchers say, to harness the power of these networks for many (19) , such as encouraging safe sex, getting more people to exercise or even (20) crime.
11（）
A.neither
B.none
C.both
D.which
参考答案：C
解析：
[考点] 词义辨析
本题要求考生根据上下文选择符合原文含义的代词，与their studies搭配。结合本段说明上文所述的研究中哪些得益于1971年至2003年的详细数据记录。从后文enabling researchers to study...得知前文所述研究的确得益于这些数据。前文所述研究共有两个，分别关于肥胖症和戒烟，因此，选择C选项both；排除A选项neither，B选项none D选项有一定干扰性，因为考生有一定的思维定势，对介词加which引导定语从句很敏感，因而在没有明白文章的情况下会盲目地优先考虑此类选项，但本句中不存在这样的定语从句，D选项应该排除。