----Must I do well in all the subjects, Mum?
----Sure, baby! As an old saying goes, knowledge is _________.
A．commandB．effortC．powerD．energy
C

試題分析：詞義辨析。A要求，命令；B努力；C權(quán)利，力量；D能量，精力；句意：—媽媽我非在所有學(xué)科中都表現(xiàn)很好嗎？—當(dāng)然。正如諺語所說：只是就是力量。根據(jù)句意說明C正確。
點評：對于名詞的詞義辨析，要放在特定的語境進行區(qū)別。特別要注意一詞多義。
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