想了好久，好久，好久，大家帮忙看看我对这道题的分析对不对？谢谢！
Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year. This year the plantings are being seriously damaged by bollworms. Bollworms, however, are not necessarily developing resistance to the cotton’s insecticide. Bollworms breed on corn, and last year more corn than usual was planted throughout cotton-growing regions. So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.
In evaluating the argument, which of the following would be most useful to establish?
A. Whether corn could be bioengineered to produce the insecticide
B. Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year(B为答案)
C. Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them
D. Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms
E. Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton
题目翻译：有抗虫性的cotton直到今年才发生大量的减产，之前只是略微减产。（从“略微”二字可以看出即使是有抗虫性的cotton也有被吃掉的可能，只不过是概率小）。这种减产是因为B虫而发生的。但是，并不一定是B虫产生抗药引起减产的。B虫喜欢吃corn，去年更多的corn种在了棉花地上。（言之意就是种corn带来了大量的虫）所以有可能就是爱吃corn的B虫把棉花大量吃掉了。
我的分析：有抗虫性的cotton发生减产有两个可能原因，一，原有B虫产生抗药性；二，种corn带来B虫的增加，即使对于有抗虫性的cotton来说也会超成其大量减产（原文说有抗虫性的cotton也有被吃掉的可能，只不过是概率小，当B虫大量增加时，这种概率就变大）。原文结论：减产原因是B虫的增加，而不一定是B虫产生抗药性。
正确选项：是否没有抗虫性的cotton今年也发生减产
（1） 也减产。说明B虫吃棉花没有针对性，对于有抗虫性的cotton和没有抗虫性的cotton通吃。这就说明是B虫增加这个原因导致的，加强了结论。
（2） 没有减产。说明B虫吃棉花有针对性，专门吃有抗虫性的cotton，这极大可能就是B虫产生抗药性。削弱原文结论。
同意
PS:【
没有减产。说明B虫吃棉花没有针对性，专门吃有抗虫性的cotton，这极大可能就是B虫产生抗药性。削弱原文结论。】这一句，或许有其他原因，比如，今年因为气候等种种原因（总之就是他因削弱）cotton大面具不produce insecticide了...
http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=2079591&id=174073&page=1&skin=0&Star=1
这个链接看过吗？前人的讨论。
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