Unlike the fossil fuels of today, biofuels are renewable sources, which mean that they will not ____ easily.
A.come out | B.break out | C.turn out | D.run out |
相关知识点
推荐套卷
Unlike the fossil fuels of today, biofuels are renewable sources, which mean that they will not ____ easily.
A.come out | B.break out | C.turn out | D.run out |