求助，caterpillar逻辑题

chenshuobj

11. Caterpillars of all species produce an identical hormone called “juvenile hormone” that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.　　Which of the following, if true, most strongly supports the view that it would not be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?
　　(A) Most species of caterpillar are subject to some natural predation.
　　(B) Many agricultural pests do not go through a caterpillar stage.
　　(C) Many agriculturally beneficial insects go through a caterpillar stage.
　　(D) Since caterpillars of different species emerge at different times, several sprayings would be necessary.
　　(E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet.

答案是C，本人做的时候在B与C之间犹豫很久，感觉这两个选项都对，一个是杀不死很多害虫，另一个是杀死很多益虫……求解

simmba

Which of the following, if true, most strongly supports the view that it would not be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above?
题目定语从句限定了B不选

chenshuobj

simmba 发表于 2013-5-2 21:49
Which of the following, if true, most strongly supports the view that it would not be advisable to t ...

多谢……看来读题真的要自习啊……

LaDuDu

不要批判题目的前提假设这一点很重要

拉美

方案目的性的削弱题，有三种顺序：方案实施了，但是达不成目的>方案具有副作用>方案不可行，逻辑题有一个原则是选择最合适的那个选项，也就是说可能同时多个选项多多少少都符合题意，但是选最优的那一个，方案目的性的优选顺序应该如上所示，第一个直接削弱（方案达不成目标)-----(第二个，有副作用，但没有直接提及方案对目标的影响）----（第三个，方案无法实施，但是方案如果可以实施可能可以达成目标，这个削弱的效果最差）
如果选项里这三种削弱同时存在，请记住最优选的顺序