单选题:Porter and Landfield's research shows that__________.

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题目内容:
Porter and Landfield's research shows that__________. A.A the change in the levels of adrenal hormones has nothing to do with the degree of brain aging
B.B the change in the levels of adrenal hormones has a lot to do with the degree of brain aging
C.C the long-term stress will gradually make the hippocampus worse
D.D None of the above is correct
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