If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that most of our brains are not getting enough exercise and, as a result, we are growing old unnecessarily soon.
Professor Taiju Matsuzawa wanted to find out why quite healthy in northern Japan appeared to be losing their ability to think and reason at a rather early age, and how the speed of getting old could be slowed down.
With a team of researchers at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages with different jobs. Computer technology helped the researchers to get most exact measurements of the volume of the front and side parts of the brain, which have something to do with intellect and feelings, and decide the human character. As we all know, the back part of the brain, which controls task like eating and breathing, does not contract with age.
Contraction of front and side parts—as cells die off—was seen in some people in their thirties, but it was still not found in some sixty and seventy-year-olds.
Matsuzawa concluded from his tests that there is a simple way to prevent the contraction—using the head.
The findings show that contraction of the brain begins sooner in people in the country than in the towns. “Those with least possibility,” says Matsuzawa, “are lawyers, followed by university professors and doctors. White collar workers doing the same work day after day in government offices are, however, as possible to have contracting brains as the farm worker, bus driver and shop assistant.”
小题1:The team of doctors wanted to find out _____.
A．at what point people grow mentally old
B．how to make people live longer
C．the size of certain people’s brains
D．which people are the most clever小题2:Their research findings are based on _____.
A．an examination of farmers in northern Japan
B．tests given on a thousand old people
C．examining the brain volumes of different people
D．using computer technology小题3:The doctors’ tests show that _____.
A．our brains contract as we grow older
B．one part of the brain does not contract
C．sixty-year-olds have better brains than thirty-year-olds
D．some people’s brains have contracted earlier than other people’s小题4:The most possible conclusion of the passage is that _____.
A．most of us take more exercise
B．it’s better to live in the town
C．the brain contracts if it is not used
D．the more one uses his brain, the sooner he becomes old
小题1:A
小题2:C
小题3:D
小题4:C
题目分析：文章介绍了一项研究的发现：不经常用脑的人的大脑比经常用脑的人会更早的时候分散注意力。所以要想保持大脑的年轻要多动脑子。
小题1:主旨题：从第二段的句子：Professor Taiju Matsuzawa wanted to find out why quite healthy in northern Japan appeared to be losing their ability to think and reason at a rather early age, and how the speed of getting old could be slowed down.可知这项调查是想弄清在什么时候人会在精神上变老。选A
小题2:细节题：从第三段的句子：With a team of researchers at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages with different jobs.可知这项研究是建立在对1000个人的脑量的检测的基础上，选C
小题3:细节题：从第四段的句子：Contraction of front and side parts—as cells die off—was seen in some people in their thirties,可知有的人的大脑比别人在更早的时候会分散注意力，选D
小题4:推理题：从倒数第二段的句子：Matsuzawa concluded from his tests that there is a simple way to prevent the contraction—using the head.可知人的大脑不经常使用会变老，选C