【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】句意：據(jù)科學(xué)家研究表明，我們大腦的能力在22歲左右達(dá)到最高，從27歲開始逐漸消退。A. differ“不同”；B. shrink “縮水”；C. fail“失敗，失靈”；D. decline “衰退，下降，吸引”。根據(jù)句意，選D。

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