If you want to stayyoung,sit down and have a good think.This is the research finding of a team ofJapanese doctors,who say that most of our brains are not getting enough

exercise一and as a result,we are ageingunnecessarily soon.

2.Professor TaijuMatsuzawa wanted to find out why otherwise healthy farmers in northern Japanappeared to be losing their ability to think and reason at a relatively early

age,and how theprocess of ageing could be slowed down.

3.With a team ofcolleagues at Tokyo National University,heset about measuring brain yolumes of a thousand people of different ages andvarying occupations.

4.Computertechnology enabled the researchers to obtain precise measurements of the volumeof the front and side sections of the brain, which relate to intellect（智能）and

emotion, anddetermine the human character. The rear section of the brain,which controlsfunctions like eating and breathing,does not contract with age,and one cancontinue

living withoutintellectual or emotional faculties.

5.Contraction of frontand side parts一as cellsdie off —was observed in some subjects in theirthirties,but it was still not evident in some sixty-and seventy-year-olds.

6.Matsuzawaconcluded from his tests that there is a simple remedy to the contractionnormally associated with age一using the head.

7.The findings showin general terms that contraction of the brain begins sooner in people in thecountry than in the towns.Those least at risk,says Matsuzawa,are

lawyers,followed byuniversity professors and doctors.White collar workers doing routine work ingovernment offices are,however, as likely to have shrinking brains as the

farm worker,busdriver and shop assistant.

8.Matsuzawa'sfindings show that thinking can prevent the brain from shrinking. Blood mustcirculate properly in the head to supply the fresh oxygen the brain cells

need."The bestway to maintain good blood circulation is through using the brain,"hesays,"Think hard and engage in conversation.Don't rely on pocketcalculators."Paragraph1________

A.Thinking can preventthe brain from shrinking.

B.The reason whypeople are aging.

C.Scientists haveworked out a way to keep people healthy.

D.Computertechnology.

E.The different timeof brain contraction between people in the country and in the towns.