以下是引用coteki在2004-7-4 21:05:00的发言：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.
(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.
Dangling or misplaced modifiers plague choices B, C, and D: in each case, the phrase if used repeatedly in the same place illogically modifies one reason rather than certain pesticides. 为什么指one reason而不能理解为指certain pesticides
(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）
如果结构是:主句,if used….
If作为条件从句,在逻辑主语与主句主语相同时,可以省略if后面的主语,所以如果if后面省略了主语,就可认为if后的逻辑主语与主句主语相同.但是这句不是这样的结构而是
Finding(主语)(that引导同位语解释finding内容)is(系)suggestive(表语)of one reason(补语),if used插入语,此处少了一个that 应该是that引导同位语从句解释reason的内容certain pesticides
既然是插入语当然是就近修饰前面名词了
不知我说清楚没
If used…作为插入语,将one reason
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发表于 2005-11-3 16:29:00
