GWD-23-Q14 (TN版_16)

40. GWD-23-Q14

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

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

正确答案为B

请分析一下是怎么得来的？我看的不是很明白啊……谢谢……

它的结论是，cotton会被corn-bred bollworms 大量破坏。选项应该是一个关于cotton和bollworms的现象。

A，关于corn的，说明不了问题

B，很好的提供了证明结论是否成立的条件。

C， other crops无关

D,insect pests 无关

E，insecticides无关