B. how to make people live longer C the size of certain people’s brains

　　D. which people are most intelligent

　　【答案】【解析】理解Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of ageing could be slowed down.”可知医生们想要研究出为什么一些人比其他人老得更快。 37. On what are their research findings based? A A survey of farmers in northern Japan.

　　B. Tests performed on a thousand old people. C The study of brain volumes of different people

　　D. The latest development of computer technology.

　　【答案】【解析】理解he set about measuring brain volumes of a thousand people of different ages and varying occupations.”可知选C。 38. The doctor’s test show that ________. A our brains shrink as we grow older

　　B. the front section of the brain does not shrink C sixty-year-olds have the better brains than thirty-year-olds D some people’s brains have contracted more than other people’s.

　　【答案】【解析】理解The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns.”可知医生们的测试发现，一般而言，乡下人比城镇里的人的大脑收缩的更早。故选D。 39. The word “subjects” in Paragraph 5 means ________. A something to be considered

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