5．The polluted water and air areharmful （有害） to people's health．

分析 被污染的水和空氣對人們的健康是有害的．

解答 答案是harmful．本題考查單詞拼寫；harmful，形容詞，有害的；題干中系動詞are后面需要的是做表語的形容詞，故答案選harmful．

點評 翻譯填空要根據(jù)所提供的漢語意思結(jié)合語境和句子結(jié)構(gòu)選擇恰當(dāng)?shù)脑~、短語或句型；同時注意句子結(jié)構(gòu)和所選詞的形式變化．

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