OG-棉铃虫

gongbing66

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?
(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
(0) 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

Can someone explain this to me?
I am kind of confused with the meaning of this one%>_<%

gongbing66

1.生物工程种植的棉花产生杀虫剂---直到今年杀虫剂失效
2.However，B没有产生抗药性
3.以玉米为食的B因为corn的扩大规模种植而增加

-----所以得出，棉花是被以玉米为食的B damage的

B是说要看不产生杀虫剂的棉花今年有没有遭受大规模的damage

这和结论有神马关系？

lonelyorchid

-----所以得出，棉花是被以玉米为食的B damage的, 再加一句，“而不

是因为害虫们发展出了抗药性”。

B选项是来评价后半句的。如果普通棉花今年被毁坏得跟往年差不多，说明害

虫今年突然进化了，发展出了抗药性；如果普通棉花今年也突然遭受大规模

的毁坏，说明很可能就是玉米地的关系。

我觉得这题很难～～ 我查了好几个人的解释才勉强给自己解释得通～～

gongbing66

害虫进化会使普通棉花遭受更多的damage~？
如果是这样的话，就懂了~谢谢呀

jasonlove

看到别人的解释，觉得很好贴过来：

原文推理：往年生化改造棉一直不怎么受虫害，今年却死得很惨。改造棉的杀虫素没有失效，所以认为是虫子太多了(simply being overwhelmed)。
B. Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year   看看没有改造过的有没有死得更惨

若有——〉说明改造棉还是比较牛，有抗虫作用，就是因为虫子太多了，加强
若无——》改造棉和普通棉一样受灾说明是改造棉的抗虫能力有了变化，而非虫子太多了，削弱