D. which people are the most clever40. Their research findings are based on _____.

　　A. an examination of farmers in northern Japan

　　B. tests given on a thousand old people

　　C. using computer technology

　　D. examining the brain volumes of different people41. According to the article, ___________are growing mentally old earlier.

　　A. engineers

　　B. office clerks

　　C. professors

　　D. researchers42. The most possible conclusion of the article is that ______.

　　A. most of us should take more exercise

　　B. it’s better to live in the towns

　　C. the brain contracts if it is not used

　　D. the more one uses his brain, the sooner he becomes old

　　D

　　Birds in cites are damaging their health by trying to sing above the noise of urban life.

　　New research shows that male birds are trying to compete against traffic and city sounds.They are now singing louder and at higher frequencies, which could harm their vocal cords. Some birds are choosing to sing at night instead of during the day. This makes them more open to attack and also creates stress and exhaustion.

　　“The difference between urban and rural birdsong is becoming so big that the two groups could now be unable to communicate. This could lead to inbreeding and a weak gene pool,” said Dr. Sue Anne Zollinger of the university of ST.Andrew.

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