pp64

pp64

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

why A? an increase...can create...problems?

umm...问题是因为增长而产生的。

B，列举用法错误，应该用such as. it指代错误，只能指代increase...substituted修饰increase逻辑不合理

C. 根据原句,substitution才会引起soil structure deterioration and soil erosion.所以they指代fertilizers与原句意思不符。

D. this substitution无法做substituted的逻辑主语，while的随意增加改变原句意思。

E. their的指代不明显,like应该用such as,while的随意增加改变原意。

Thanks!