According to scientists, our mental abilities begin to____ from the age of 27 after reaching the highest level at 22.
A．differB．shrinkC．failD．decline
D

試題分析：考查動詞辨析：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，選D。
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