It can be inferred from the first paragraph that _____. A. water vapor is an air pollutant in localized areas B. most air pollutants today can be seen or smelled C. the definition of air

It can be inferred from the first paragraph that _____.

A. water vapor is an air pollutant in localized areas
B. most air pollutants today can be seen or smelled
C. the definition of air pollution will continue to change
D. a substance becomes an air pollutant only in cities

Trả lời

Đáp án C

Air pollution requires a very flexible definition that permits continuous change.

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