An air pollutant is defined as a compound added directly It can be inferred from the first

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer answer to each of the questions

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

* Đáp án

C

* Hướng dẫn giải

Đáp án C

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