The word “this” in the third paragraph refers to

Câu hỏi :

Read the following passage and mark the letter on your answer sheet to indicate the correct word for each blank.

A. man’s upsetting the equation

B. the reduction of the level of carbon dioxide. 

C. a volcanic eruption

D. the melting of the polar ice caps

* Đáp án

* Hướng dẫn giải

   Đáp án là A. this = man’s upsetting the equation : Dựa vào câu ngay trước đó.

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