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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1809

- Air quality in our city is becoming worse and worse.
- Yes. These days' PM2.5 readings are frightening. We must do something to _______ air pollution.

A.reduce B.remove C.collect D.gather
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