Q39P64
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
LZ说的没有错，Whereas确实要求前后平行，所以可以首先排除C。
接下来需要分析use和usage的区别：
use：an instance or way of employing or using something.强调方法。
usage:a customary way of doing something.强调惯用的习俗或者俗语。
所以排除DE。
接下来可以用简单的idiom排除like举例是不对的，所以答案是A。
其实D的句型也不对，Whereas A, B, while if的句型不知道究竟是谁和谁
在比较，另外不曾有印象看到while if连用的说。
选项A是一个由and连接的完全平行的句子，非常Beautiful。
an increase in their use vs their substitution for more
traditional fertilizers
can vs may
create serious environmental problems vs accelerate soil structure
deterioration and soil erosion作者: coloryao 时间: 2012-10-10 21:22
P64