FOR WHICH OF THE FOLLOWING REASONS CAN NATURAL POLLUTANTS PLAY AN IMP...

Câu 53: For which of the following reasons can natural pollutants play an important role in controlling

air pollution?

A They occur in greater quantities than other pollutants.

B They function as part of a purification process.

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

D They have existed since the Earth developed.