124. (31091-!-item-!-188;#058&004372)
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
正确答案是A.
但是CD错在哪里，请赐教！
看了findjuhl的笔记，对这题的解释看不明白。请高手支招！
看到同样的问题贴在不同的地方，把链接汇总如下：
代词指代：
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=326798&replyID=&skin=1
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=341635&replyID=3067364&skin=1
if 从句：
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=342963&replyID=&skin=1
我的分析和疑问如下：
d. whereas..., the increased usage of...can create...,while...这里whereas 和 while 各自引导的两个从句在句子中起一样的从句功能，又没有被并列连接起来。句子结构复杂且有误。
c.错在substitution。作为替换（这个动作）不对，而应该是作为替换物（substitute)。那么如果将 c 改为两个完整的主从主从并列，配合未划线部分的whereas...从句，在选项 a 不存在的前提下，对么？
Whereas the use of synthetic fertilizer has greatly expanded agrecultural productivity in many parts of the world, if these fertilizers are used increasingly,they can create serious environmental problems such as water pullution, and if these fertilizers are used as substitutes for more traditional fertilizers, they may accelerate soil structure deterioration and soil erosion.
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