Câu hỏi :

Read the following passage and choose the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 33 to 42.    

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

B

* Hướng dẫn giải

Chọn B

Nội dung đáp án B là: cấu tạo của chất gây ô nhiễm môi trường. Dựa vào: “A useful definition of an air pollutant”, “Many of the more important air pollutants”, “The actual concentration need not be large for a substance to be a pollutant”.

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