Oil, coal and natural gas are ____ fuels made from decayed material.
A. unleaded
B. smokeless
C. solid
D. fossil
unleaded (adj): không chứa chì
smokeless (adj): không khói thuốc
solid (adj): rắn
fossil (adj): hóa thạch
=> Oil, coal and natural gas are fossil fuels made from decayed material.
Tạm dịch: Dầu mỏ, than đá và khí đốt thiên nhiên là những nguồn năng lượng hóa thạch được sinh từ sự mục rữa của động thực vật
Đáp án cần chon là: D
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