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标题: [讨论]GWD-23-Q14 [打印本页]

作者: 我要飞 时间: 2009-3-29 17:33
标题: [讨论]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?

Whether corn could be bioengineered to produce the insecticide
Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year
Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them
Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms
Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton

B 在这道题里 is simply being overwhelmed 是什么意思呀？B选项起的是什么作用？按XDF的说法，evaluation的正确答案要一端能削弱一端能加强，这个怎么加强削弱了？

作者: 大胖 时间: 2009-3-31 16:08

cotton bioengineered
能够分泌杀虫物质。今年遭到虫害很严重。排出抗药性这个可能。于是，作者推论：去年种了特别多corn，所以养了特别多虫。今年种的corn和以前差不多（但是小于去年，我估计是这样）。所以虫就对corn毁坏严重。

B 是不是不具有分泌杀虫物质的corn也遭受不同往常的大虫害。如果是因为去年虫多的原因，那么不具有分泌杀虫物质的corn也应该遭受不同往常的大虫害

作者: xiaolishally 时间: 2009-7-29 17:30
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