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. the compounds moved to the water or soil

B. the components in biogeochemical cycles

C. the pollutants from the developing Earth

D. the various chemical reactions 

* Đáp án

B

* Hướng dẫn giải

Đáp án B

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