标题: OG-棉铃虫 [打印本页] 作者: Sonehri 时间: 2011-3-11 19:05 标题: OG-棉铃虫 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%>_<%作者: Sonehri 时间: 2011-3-11 19:11
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
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