What does the passage mainly discussThe economic impact of air pollution

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 from 55 to 64

A. The economic impact of air pollution. 

B. The effects of compounds added to the atmosphere

C. What constitutes an air pollutant 

D. How much harm air pollutants can cause.

* Đáp án

* Hướng dẫn giải

Đáp án là C

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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