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.
5（）
A.between
B.among
C.in
D.through
参考答案：D
解析：
[考点] 词义辨析
本题要求考生判断空格处应填入的适当的介词。本句的主干内容已经比较清晰，即两位研究者报告说肥胖症像病毒或时尚一样在人们之间传播，需要填入的是传播的途径。本文的主旨是社交圈对人们的影响，那么社交圈(social network)应该就是传播的途径。所以只有D选项through符合要求。本文只说明社交圈是肥胖症传播的载体，并没有说明是圈内传播还是各个社交圈落之间传播，所以A选项between、B选项among和C选项in都无从考据，故可排除。