题目内容

Many of us believe that a person‘s mind becomes less active as he grows older. But this is not true， according to Dr Jarvik， professor of psychiatry at the University of California. She has studied the mental functioning of aging persons for several

提问人：ylm发布时间：2020-10-09

A) how Dr Jarvik studied mental functioning of the twins.

B) what caused mental decay.

C) the results evidenced by Dr Jarvik‘s studies.

D) the difference between middle – aged and older persons

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Many of us believe that a person‘s mind becomes less active as he grows older. But this is not true， according to Dr Jarvik， professor of psychiatry at the University of California. She has studied the mental functioning of aging persons for several

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