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A．Our brain contract as we grow old.
B．One part of the brain does not contract.
C．Sixty-year olds have better brains than thirty-year olds.
D．Some people's brains have contracted earlier than other people's.

A.Our
B.
B．One
C.
C．Sixty-year
D.
D．Some

【参考答案】

D
解析：What do the doctors' tests show?

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A．Most of us should take more exercise.B．It's better to live in the town.C．The brain contracts if it is not used.D．The more one uses his brain, the sooner he becomes old.

A．Our brain contract as we grow old.B．One part of the brain does not contract.C．Sixty-year olds have better brains than thirty-year olds.D．Some people's brains have contracted earlier than other people's.