请教一道逻辑真题

sunnybest

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?

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

yangxiaogang

I choose B, is it right?

sunnybest

答案是对的，但我对这题完全没有思路。

yangxiaogang NN,能否请你指点指点？

BTW，看了你很多帖子，觉得你很有实力，什么时候考呀？

yangxiaogang

多谢SUNNY,我很快就要考试了，实力很差，我是一只努力想向上攀登的小动物。岁月不饶人，你说答案对了，我就敢把我的思路说出来，要不对的话就麻烦、献丑了！哈哈！

原题试图建立So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.这样的因果关系，但是从题目中我们只能推出他们是只是同时发生的关系（棉花虫害和玉米过多）还不足以断定棉花虫害是由于吃玉米的害虫多了.要评价这种因果关系是否存在，可以用类比来判断（如B所述）：如果是YES,对原文的因果关系起了加强的作用，如果是NO,则明显削弱了原文的推理过程。而其他四个选项则不具有这样的两面功能,你可以分别是着回答YES或者NO来体会。我估计等你把其他四个都这样尝试一下，你就自然会察觉B的好了，当然这种解题方法不适合实战，因为比较浪费时间，我做的时候是直接用无关排除最后再用这种思路验证一下选的，所以当时不是很肯定.

sunnybest

看来我的理解又有偏差了。我选的是D。

我对结论的理解是这样的：So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.棉花只受到了corn-bred bollworms的侵害。我把simply理解成了only。我这样理解难道不行吗？

yangxiaogang, 祝你考试顺利，我也要考了，在准备最后的冲刺，不过还是觉得实力不济呀，呵呵：)