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3.As we all know,smoking is harmful to our health.

分析 众所周知,吸烟对我们健康有害.

解答 答案是harmful.本题考查语境中选用恰当的词或短语;harmful adj.有害的;be harmful to对…有害的;故答案是harmful.

点评 首字母填空必须在对语境整体理解的基础上抓住指向答案的关键线索、固定句型或搭配等,并联系首字母,同时注意所选词的形式变化.

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