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

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It can be inferred from the first paragraph that _____.

water vapor is an air pollutant in localized areas

most air pollutants today can be seen or smelled

the definition of air pollution will continue to change

a substance becomes an air pollutant only in cities

Giải thích

Đáp án C

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