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

◎ 题干

— 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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◎ 解析

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◎ 知识点

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