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题库 / OG2017V-CR-178
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 it be most useful to establish?
Whether corn could be bioengineered to produce the insecticide
Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year
Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them
Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms
Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton
一个比较独特的相关到因果的题目。题目的推理是：corn今年种的多（这是一个与往年比不同寻常的因素），所以就是吃corn的虫子导致了cotton的虫害。也就是说，是一个外因影响了这件事的发生。那么，如果确实是这个外因的话，普通的不防cotton虫害的cotton应该就会以同样的规模减产，因为普通和防cotton虫的cotton对于corn虫的抵抗能力都很差。B的逻辑就是这个了
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