Read the following passage and m...

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 36 to 42.

A. How pollutants contaminate the natural surroundings.

B. The causes and effects of air pollution.

C. Our ecosystem and the balance in the environment.

D. Some solutions to air pollution.