Airqualityinourcityisbecomingw

更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 1805

- 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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