请教,题都没读懂

1.        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?

 

1. Whether corn could be bioengineered to produce the insecticide

2. Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year

3. Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them

4. Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms

5. Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton

B  

选B吗？

经过生物工程改造了的棉花植株在今年之前都有很好的抗B虫的效果,但今年这种棉花受到了B虫的严重破坏.B虫产生抗性的可能性很小.B虫以谷物为食,而去年在种植棉花的地区有比往年更多的谷物种植.所以得出结论棉花很可能是受到了食谷B中的大量破坏.

选B.如果没有经过生物工程改造的棉花也大量被毁,则原因有可能是除了B虫之外的其他原因.

请指教

谢谢两位,我拷下来慢慢看

同意，请各部门领导阅！

对对对，楼上两位的解释非常好，感谢！！！

选B是没有什么问题的

但B中

Whether plantings of cotton (that does not produce the insecticide) are suffering unusually extensive damage from bollworms this year

我括号里面的东西好象好怪呀,怎么cotton  produce the insecticide 什么意思呢