【題目】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發(fā)展；D. decline下降。句意：根據(jù)科學(xué)研究，我們的記憶力在22歲到達(dá)頂峰研究從27歲就開始下降了。

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