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

分析 眾所周知，吸煙對我們健康有害．

解答 答案是harmful．本題考查語境中選用恰當的詞或短語；harmful adj．有害的；be harmful to對…有害的；故答案是harmful．

點評 首字母填空必須在對語境整體理解的基礎上抓住指向答案的關鍵線索、固定句型或搭配等，并聯(lián)系首字母，同時注意所選詞的形式變化．

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