Đề thi chính thức Tiếng Anh vào 10 năm 2020-2021 (Đề 7)

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

8/47

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

at

in

on

of

Giải thích

Chọn đáp án D.