单选题：The research conducted by Porter and Landfield shows that

题目分类：卫生类
题目类型：单选题
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题目内容：

The research conducted by Porter and Landfield shows that A．changes in the levels of adrenal hormones have nothing to do with brain agin
B．changes in the levels of adrenal hormones may affect brain agin
C．chronic stress may strengthen a man's memor
D．the rate of brain aging always remains stabl

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分类：卫生类题型：单选题