单项选择题

The team of doctors wanted to find out

A．why certain people are aging sooner than others
B．how to make people live longer
C．the size of certain people's brains
D．which people are most intelligent

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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

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.