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这是一道逻辑题，但我主要是语法搞不清进而导致意思都不懂，所以发到语法区来了。
题目中的C选项，百思不得其解，为什么前面又是which后面又有them。请大牛帮忙翻译。谢谢！
Plantingsof cotton bioengineered to produce its own insecticide against bollworms, amajor 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. Bollwormsbreed on corn, and last year more corn than usual was planted throughout cottongrowing regions. So it is likely that the cotton is simply being overwhelmed by corn-bredbollworms.
In evaluating the argument, which ofthe 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 resist the pests against which the insecticide was to protect them (D)Whether plantings of bioengineered cotton are frequently damaged byinsect pests other than bollworms (E) Whether there are insecticides thatcan be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton
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发表于 2017-8-22 18:49:16
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