Câu 27: According to the author, what is the impracticability of using coal, oil shale and coal tars' as
sources of energy due to?
A. They take a lot of time B. They are scarce resources
C. They are non-renewable resources D. They are expensive
Bạn đang xem câu 27: - Đề KSCL giữa HK2 Tiếng Anh 11 năm 2017 – 2018 trường Đồng Đậu – Vĩnh Phúc -
