题目内容
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[主观题]
The research conducted by Porter and Landfield shows thatA．changes in the levels of ad
The research conducted by Porter and Landfield shows that
A．changes in the levels of adrenal hormones have nothing to do with brain aging.
B．changes in the levels of adrenal hormones may affect brain aging.
C．chronic stress may strengthen a man's memory.
D．the rate of brain aging always remains stable.
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