Đề kiểm tra: Practice test 3 có đáp án
Xem toàn bộ quiz

Dirty air is a serious problem in many (30) ________ of the world. Without our forests

30/40

Dirty air is a serious problem in many (30) ________ of the world. Without our forests, this problem might be much worse.

parts

areas

districts

countries

Giải thích

Chọn đáp án A