200.Certain pesticides can become ineffective if used repeatedly in the same place: one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(A) Certain pesticides can become ineffective if used repeatedly in the same place; one reason is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(B) If used repeatedly in the same place, one reason that certain pesticides can become ineffective is suggested by the finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals.
(C) If used repeatedly in the same place, one reason certain pesticides can become ineffective is suggested by the finding that much larger populations of pesticide-degrading microbes are found in soils with a relatively long history of pesticide use than those that are free of such chemicals.
(D) The finding that there are much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in soils that are free of such chemicals is suggestive of one reason, if used repeatedly in the same place, certain pesticides can become ineffective.（A）
(E) The finding of much larger populations of pesticide-degrading microbes in soils with a relatively long history of pesticide use than in those that are free of such chemicals suggests one reason certain pesticides can become ineffective if used repeatedly in the same place.
其中（1）不明白D项的句子结构，只知道The finding that ... is suggestive, if used repeatedly in the same place, certain pesticides can ...是句子主干，但句子意思和结构不明白，关键看不懂if 的链接作用
（2）不明白，the phrase if used repeatedly in the same place illogically modifies one reason rather than certain pesticides.（摘自OG10的注解）即为什么if 从句修饰one reason ？ 作者: thinkingape 时间: 2011-5-19 21:31
D有两处问题：
1、finding is suggestive of one reason，这种表达结构太那什么了，finding suggests one reason要简洁的多。GMAT里，能用动词就不要用形容词，过于罗嗦了。
2、前后两个句子用逗号连接，这个也是明显的错误
先谢谢楼上的回复。
我谈一下自己的体会：
D项：The finding is suggestive of one reason, if used repeatedly in the same place, certain pesticides can become ineffective.这是句子主干，但有问题的是if 引导的从句没有办法做同位语修饰reason,因为只有that能引导同位语，但为什么OG的解释是the phrase if used repeatedly in the same place illogically modifies one reason rather than certain pesticides.
在我看来，if 从句本身就不可能去修饰reason这是语法上的错误，但为什么OG却把它定位成修饰关系上的错误，求大牛指导！作者: arthurman 时间: 2011-5-21 19:52
理清一下，OG的解释引用的是If used repeatedly错误修饰reason。 used
修饰紧跟其前的名词reason即 if (the reason) used repeatedly... 逻辑错
误， 只能是if (pesticides) used repeatedly
本题首先排除BC, one reason做前面used的逻辑主语错误
D项同样的逻辑修饰错误+ suggestive不简洁
E The finding of ....全句awkward作者: yangmbalin 时间: 2011-5-23 06:37
