答案:A
5.Which of the following can best express the moral of the story?
A.Mind works faster in time of danger.
B.Never put your nose into others’ business.
C.We should pull together in time of trouble.
D.Out of sight,out of mind.
解析:主旨大意题。作者通过一个寓言故事告诉我们:看似与自己无关的事情却能对自己造成灾难。因此,无论谁遇到困难,大家都应该齐心协力共渡难关。故选C项。
答案:C
B
Long-time exposure to air pollution can lead to physical changes in the brain and cause trouble in learning and memory,and even anxiety.This is suggested by the results of new research on mice.
While other studies have shown the harmful effects of polluted air on the lungs and heart,this is the first to show the negative effect on the brain.
The team of Laura Fonken,Randy Nelson,from the Ohio State University,U.S.A.,has spread to the brain a previous line of research which found that fine particulate(微粒) matter floating in the air mainly because of air pollution caused by humans,causes swelling in much of the body,and may be related to high blood pressure problems,and some other diseases.
In the research Fonken and his colleagues exposed mice to polluted air for six hours each day,five days a week,over a period of 10 months,almost half the average life length of mice.
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