It can be inferred from the first paragraph that _____. water vapor is an air pollutant

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 34 to 40.

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

Chọn C

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

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