题目内容

18．─Do you know          second-hand smoke？
─To protect our health and memory．（　　）
A．how we should preventB．how we should prevent
C．why we should preventD．whether we should prevent

分析 句意：-你知道为什么我们应该阻止二手烟？-为了保护我们的健康和记忆．

解答 本题是疑问词引导的宾语从句，根据To protect our health and memory．可知，疑问词用why来引导宾语从句，疑问词后面用陈述语序，should后面跟动词原形，所以why we should prevent正确，故选：C．

点评 本题考查疑问词引导的宾语从句，要根据句意确定疑问词，要注意疑问词后面用陈述语序，should后面用动词原形．

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