这题如何解释？GWD的~

frankzhiwei

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

为何是B，本人选了A~感谢！

shicing

这个问题的意思是说.
1)棉花有抵抗虫子的能力,2)玉米过度种植,使得以玉米为生的虫子多了许多.
所以得到结论是是否"棉花因玉米过度种植(虫子)而遭到破坏"

B说,普通棉花的情况是如何,
如果普通棉花田里死伤惨重,那原来田有抵抗力的棉花应该死不了(因为他们有抗体),所以那就是玉米搞的鬼了
如果普通棉花没死,那么就不是玉米搞的鬼.

frankzhiwei

感谢回复！没想到还是有有心人的！

frankzhiwei