Matsuzawa concluded from his tests that there is a simple cure for the contraction normally connected with age using the brain．

　　The findings show in general conditions that contraction of the brain begins soon among people in the country than in the town．Those are at least at risk，says Matsuzawa，who are lawyers，followed by university professors and doctors．White collar workers doing regular work in government offices are, however，as likely to have shrink（收缩）as the farm workers，bus drivers and shop assistants．

　　Matsuzawa’s findings show that thinking can prevent the brain from shrinking．Blood must flow through a circle properly in the head to supply the fresh oxygen the brain cells need．"The best way to keep good blood movement is through using the brain，" he says．" Think hard and engage in conversation．Don’t depend on pocket calculators．"

　　68．The team of doctors wanted to find out__________．

　　A．how to make people live longer

　　B．why certain people age sooner than others

　　C．how people stay young

　　D．which people are most intelligent

　　69．On what are their research findings based？

　　A．A study of farmers in northern Japan．

　　B．Tests performed on a thousand old people．

　　C．The study of brain volumes of different people．

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