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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】A. differ不同于；B. shrink增加；C. fail发展；D. decline下降。句意：根据科学研究，我们的记忆力在22岁到达顶峰研究从27岁就开始下降了。

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