For which of the following reasons can natural pollutants play an

Câu hỏi :

For which of the following reasons can natural pollutants play an important role in controlling air pollution? 

A. They have existed since the Earth developed.


B. They occur in greater quantities than other pollutants.


C. They are less harmful to living beings than other pollutants.

D. They function as part of a purification process.

* Đáp án

D

* Hướng dẫn giải

Đáp án D

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