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
答案是A, 我觉得是D, 它给D的错误理由是
if substituted…, this substitution…的表达方式啰嗦不简洁；while表达了转折的含义，而原句中由
不用怀疑官方答案的正确性，我们要做的是研究为什么答案是对的，而不是钻牛角尖想答案可能会是错的。GMAC才是制定游戏规则的人。D选项"while if substituted for more traditional fertilizers, this substitution"部分错误。如果前面是一个modifier（没有主语的），那么逗号后面紧接着的句子的名词就是前面的逻辑主语。这里if没有主语，所以用后面的substituition做主语，2个substitution，错误。
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发表于 2009-3-9 16:13:00
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