解析:词义猜测题。通过对上文的理解可以判断,牛的意思是“我很抱歉,但是这不关我的事”。故选A项。

　　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.

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