According to the passage, we should use renewable energy sources because they are ………………..

Câu hỏi :

According to the passage, we should use renewable energy sources because they are ………………..

A. emitting greenhouse gases

B. invaluable

C. eco- friendly

D. limited

* Đáp án

C

* Hướng dẫn giải

Dẫn chứng: That is why environmentalists insist that we use clean, renewable energy sources. Wave energy, produced by ocean surface waves, is both eco-friendly and cost-efficient.

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