問題詳情
31. Biofuels are mainly produced by:
(A) plants that convert hemicellulose into gasoline.
(B) the breakdown of cell wall biopolymers into sugars that can be fermented.
(C) the genetic engineering of ethanol generating genes into plants.
(D) plants that are easy to grow in arid environments.
參考答案
答案：B
難度：困難0.361111
統計：A(7),B(13),C(6),D(3),E(0)