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

試題分析：動詞辨析。A不同于；B增加；C發(fā)展；D下降；句意：根據(jù)科學研究，我們的記憶力在22歲到達頂峰研究從27歲就開始下降了。故D正確。
點評：動詞的詞義辨析要放在上下文的語境中進行，要注意上下文的語義的串聯(lián)以及邏輯關系的推理，特別要注意一些動詞的固定搭配以及動詞的深層次的含義的區(qū)別。
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