Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.

Câu hỏi

The gradual rise in the Earth's temperature is known as ____.

A. greenhouse effect

B. global warming

C. ozone layer

D. acid rain

Đáp án
B. global warming

Câu hỏi thuộc Bài tập:

Ms. Dung Purple - Unit 9: Protecting the Environment - Vocabulary