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    【题目】According to scientists, our mental abilities begin to _____ from the age of 27 after reaching the highest level at 22.
    A.differ
    B.shrink
    C.fail
    D.decline

    【答案】D
    【解析】句意：据科学家研究表明，我们大脑的能力在22岁左右达到最高，从27岁开始逐渐消退。A. differ“不同”；B. shrink “缩水”；C. fail“失败，失灵”；D. decline “衰退，下降，吸引”。根据句意，选D。

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