单项选择题

The doctor's test show that ______.

A．our brains shrink as we grow older
B．sixty - year - olds have better brains than thirty - year - olds
C．the front - section of the brain does not shrink
D．some people's brains have contracted more than other people's

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单项选择题

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.