An air pollutant is defined as a compound added directly or indirectly by humans

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. 

A. How much harm air pollutants can cause.

B. The effects of compounds added to the atmosphere.

C. What constitutes an air pollutant?

D. The economic impact of air pollution. 

* Đáp án

C

* Hướng dẫn giải

Đáp án C

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