标题: 不明白,看了解释还是不明白,救命 [打印本页] 作者: 毛毛掸 时间: 2012-12-6 22:02 标题: 不明白,看了解释还是不明白,救命 OG verbal 分册 逻辑 #70 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, however, are not necessarily developing resistance to the cotton's insecticide.Bollworms breed on cprn, 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.
主要在纠结的是E选项 E。Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton.