[简答题]Other tests have shown that laughter appears to be able to re- duce the effect of pain on the body.

[简答题]Other tests have shown that laughter appears to be able to re- duce the effect of pain on the body.

[单项选择]The DNA test, together with other tests,（）the prisoner’s innocence.
A. proves
B. prove
C. proving
D. have proved

[单项选择]Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which （　） affects the circulatory system.
A. in turn
B. in return
C. turn back
D. as a result

[填空题]Intelligence tests have now been proved to be unreliable.

[单项选择]

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 strongly affected by (9) other people in their social network quit—even pe
A. how
B. that
C. what
D. whether