Chemicals and wastes from factories consist ______ sulphur and nitrogen oxides that are dangerous for our health.

Câu hỏi :

Chemicals and wastes from factories consist ______ sulphur and nitrogen oxides that are dangerous for our health.

A. at                                   

B. in                                   

C. on                                  

D. of

* Đáp án

* Hướng dẫn giải

Chọn đáp án D.

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