If you want to stay young, sit down and have a good think. This is the research【C1】______o

f a team of Japanese doctors, who say that most of our brains are not getting enough exercise -- and【C2】______, we are ageing unnecessarily soon.

With a team of colleagues at Tokyo National University, Professor Taiju Matsuzawa【C3】______measuring brain volumes of a thousand people of different ages and【C4】______occupations.

Computer technology enabled the researchers to obtain【C5】______measurements of the volume of the【C6】______and side sections of the brain, which relate【C7】______intellect and emotion, and determine the human character.(The【C8】______section of the brain, which controls【C9】______functions as eating and breathing, does not【C10】______with age, and one can continue living without【C11】______or emotional faculties. )

Contraction of front and side parts -- as cells die【C12】______-- was observed in some subjects in【C13】______thirties, but it was still not evident in some sixty and seventy year olds.

Matsuzawa concluded from his tests that there is a simple【C14】______to the contraction normally associated with age -- using the head.

The findings show in general【C15】______that contraction of the brain begins【C16】______in people in the country than in the towns. Those【C17】______at risk, says Matsuzawa, are lawyers, followed by university professors and doctors. White collar workers doing【C18】______work in government offices are,【C19】______, as likely .to have shrinking brains【C20】______the farm worker, bus driver and shop assistant.

【C1】

A．result

B．outcome

C．finding

D．discovery