Câu hỏi :

We have to start conserving.....................

A. coal

B. oil

C. gas

D. All are correct

* Đáp án

D

* Hướng dẫn giải

Dẫn chứng: We have to start conserving coal, oil and gas before it is too late, and nuclear power is the only alternative. 

Copyright © 2021 HOCTAP247