It can be inferred from the first paragraph that

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. most air pollutants today can be seen or smelled

B. water vapor is an air pollutant in localized areas

C. a substance becomes an air pollutant only in cities

D. the definition of air pollution will continue to change

* Đáp án

* Hướng dẫn giải

Đáp án là D

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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