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

答案是B , 我被又是cotton 又是corn弄糊涂了,请指教啊!;)

Diagnose:

种植一种被基因改良的能够自己制造杀虫剂抵抗蛾子（a major cause of crop failure）的棉花,到今年的效果只能维系到little的水平.今年种植物遭受了严重的虫害. 但是蛾子并没有进化到能够对付这种棉花的杀虫剂.蛾子吃玉米,而且在整个玉米种植地区去年比往常更严重, 所以这样看来, 棉花将被这些以玉米为食的蛾子轻松打败

B. 未受改良的棉花是否也遭遇了不同以往的严重虫害

E. 是否有已经有杀虫剂,能够对付已经进化了的、能够对付被基因改良的棉花制造的杀虫剂的蛾子

自己来顶一下..

还是沉下去了吗?