8．As is known to all，smoking isharmful （有害的） to our health．

分析 眾所周知，吸煙有害健康．

解答 答案：harmful．
分析句子結(jié)構(gòu)可知，本句考查短語be harmful to對…有害；故答案為harmful．

點評 翻譯填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．

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