An air pollutant is defined as a compound added directly What does the passage mainly discuss?

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. The economic impact of air pollution

B. What constitutes an air pollutant

C. How much harm air pollutants can cause

D. The effects of compounds added to the atmosphere

* Đáp án

C

* Hướng dẫn giải

Đáp án C

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