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.
1（）
A.so
B.but
C.as
D.although
参考答案：B
解析：
[考点] 逻辑关系
本题要求考生判断空格处应填入什么连词，使前后逻辑关系连贯。空格处上文指出，网站揭示新的网络交际现象(phenomenon of social networking)，下面一句话则是以at the same time为标志指出越来越多证据表明传统社交圈落(traditional social networking)对行为的影响作用，我们可以判断，本文第一段涉及“网络交际”和“传统交际”的对比，提及“网络交际”只不过在引入话题，“传统交际”才是后文论述的要点。因此空格处前后在逻辑上是转折关系，应选择but，意思是“尽管诸多网站在公布网络交际的有利现象，但与此同时传统交际圈对行为的影响日益得到证实。”因此B选项正确。
[干扰项分析] A选项so表因果，放入原文中表示“网站公布网络交际的影响，因此传统交往的影响得到证实……”，显然不符合逻辑。C选项as的用法比较灵活，其中一种用法相当于D选项although，表示“虽然，尽管”；二是表原因；三表示伴随；四可以引导定语从句，除此之外还可以引导比较状语从句。