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

Câu hỏi

Water, solar and wind are ___________ sources of energy.

A. friendly environmental

B. environment – friendly

C. friendly environment

D. environmental friendly

Đáp án
B. environment – friendly

Câu hỏi thuộc Bài tập:

E11- Unit 3- Practice 3