Around 200 million people are employed in tourism worldwide, making it the largest industry in the

Câu hỏi :

Read the following passage and mark the letter A,B,C,D on your answer sheet to indicate the correct word for each of the blanks.

A. at 

B. on 

C. for 

D. to 

* Đáp án

* Hướng dẫn giải

Đáp án là D.

Threat to the environment: nguy hiểm cho môi trường 

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