According to scientists, our mental abilities begin to _______ from the age of 27 after reaching the highest level at 22．
A．declineB．differC．failD．shrink
A

試題分析：句意：據(jù)科學家研究表明，我們大腦的能力在22歲左右達到最高，從27歲開始逐漸消退。A. decline 衰退，下降，吸引， B. differ不同， C. fail失敗，失靈，D. shrink 縮水，選A。
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