单选题：What does the new study find about mental functions?

题目分类：英语四级
题目类型：单选题
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题目内容：

What does the new study find about mental functions? A．Some diseases inevitably lead to their decline．
B．They reach a peak at the age of 20 for most people．
C．They are closely related to physical and mental exercise．
D．Some of them begin to decline when people are still young．

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答案解析：

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