prep1-124

le_le1109

Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world, an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers may accelerate soil structure deterioration and soil erosion.

 

(A) an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers

(B) an increase in their use can create serious environmental problems like water pollution, and if substituted for more traditional fertilizers, it

(C) if these fertilizers are used increasingly, they can create serious environmental problems such as water pollution, and if used as substitutions for more traditional fertilizers, they

(D) the increased usage of these fertilizers can create serious environmental problems such as water pollution, while if substituted for more traditional fertilizers, this substitution

(E) the increased usage of these fertilizers can create serious environmental problems like water pollution, while their substitution for more traditional fertilizers

请教一下大家：

whereas 做比较,比较对象不是应该对等嘛?那the use和an increase怎么对等呢？

cllcchocolat

whereas做比较时,比较对象不要求完全对等

举例用such as,排除B, E

C, they指代fertilizers, 错,应该指代fertilizers的使用增长create problems

D, if sbustituted...this substitution...且while 有转折的意思,原文是and