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. water vapor is an air pollutant in localized areas 

B. most air pollutants today can be seen or smelled

C. the definition of air pollution will continue to change

D. a substance becomes an air pollutant only in cities

* Đáp án

C

* Hướng dẫn giải

Chọn C

Câu 2 đoạn 1: “Air pollution requires a very flexible definition that permits continuous change” ô nhiễm không khí yêu cầu 1 định nghĩa phức tạp cho pháp sự thay đổi.

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