As we all know, smoking ___________ people’s health.
A．is harmful toB．do harm foC．does harmful toD．harm
A

試題分析：考查詞組和主謂一致：對…有害：be harmful to或do harm to或用harm sth，所以先排除C項，當主語是動名詞的時候，謂語是單數(shù)，選A。
點評：詞組的考查主要是看意思相同的短語，主謂一致的考點較多，要在理解的基礎上加以記憶，多練習加以鞏固。這里的考查動名詞做主語，還有不定式做主語，謂語都是單數(shù)，關鍵是記憶。
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