14．Polluted air isharmful （有害的） to people's health．

分析 被污染的空氣對人的健康是有害的．

解答 73．harmful，考查形容詞的用法，由中文意思可知應(yīng)使用動詞harm的形容詞形式harmful，be harmful to"對…有害"．

點評 考查詞匯的記憶，在平時的學(xué)習(xí)中，要對詞匯的應(yīng)用進行積累．

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