C. They have a poor sense of smell.

　　D. They are protective of their hosts.

　　31. It can be inferred from the last paragraph that Vosshall’s research______.

　　A. looks very promising

　　B. has saved millions of lives

　　C. is facing great difficulties

　　D. is quite simple to carry out.

　　D.

　　Too much TV-watching can harm children’s ability to learn and even reduce their chances of getting a college degree, new studies suggest in the latest effort to examine the effects of television on children.

　　One of the studies looked at nearly 400 northern California third-graders. Those with TVs in their bedrooms scored about eight points lower on math and language arts tests than children without bedroom TVs.

　　A second study, looking at nearly 1000 grown-ups in New Zealand, found lower education levels among 26-year-olds who had watched lots of TV during childhood. But the results don’t prove that TV is the cause and don't rule out that already poorly motivated youngsters(年轻人）may watch lots of TV.

　　Their study measured the TV habits of 26-year-olds between ages5 and 15. These with college degrees had watched an average of less than two hours of TV per weeknight during childhood, compared with an average of more than 2 1/2 hours for those who had no education beyond high school

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