PM 2.5 does harm to people's health and the environment.（保持句意基本不变）PM 2.5 is people's health and the environment.

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1. (2017·上海) PM 2.5 does harm to people's health and the environment.（保持句意基本不变）
PM 2.5 is people's health and the environment.

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2017年上海市中考英语真题试卷（含听力音频）