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. can overwhelm the natural system that removes pollutants

B. can be dwarfed by nature’s output of pollutants

C. will damage areas outside of the localized regions

D. will react harmfully with natural pollutants 

* Đáp án

A

* Hướng dẫn giải

Đáp án A

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