用Helr的分类 分析OG68题

cherryfish1209

"        68.        Scientists have modified feed corn genetically, increasing its resistance to insect pests. Farmers who tried out the genetically modified corn last season applied less insecticide to their corn fields and still got yields comparable to those they would have gotten with ordinary corn. Ordinary corn seed, however, costs less, and what these farmers saved on insecticide rarely exceeded their extra costs for seed. Therefore, for most feed-corn farmers, switching to genetically modified seed would be unlikely to increase profits. 
Which of the following would it be most useful to know in order to evaluate the argument?
        .        (A)  Whether there are insect pests that sometimes reduce feed-corn yields, but against which commonly used insecticides and the genetic modification are equally ineffective
        .        (B)  Whether the price that farmers receive for feed corn has remained steady over the past
(C) Whether the insecticides typically used on feed corn tend to be more expensive than insecticides typically used on other crops
(D) Whether most of the farmers who tried the genetically modified corn last season applied more insecticide than was actually necessary
(E) Whether, for most farmers who plant feed corn, it is their most profitable crop

各位大侠，这题应该分为因果推理还是类比推理呢？求教

Helr

在很多GMAT考试题目中，都具有两个东西比来比去。但是请注意，并不是两个东西比较就是类比推理。类比推理的特点是，“用相似推导相似”。也就是说，结论中提到的内容，一定在前提中出现过。比如：“小明饿了，所以我也饿了”，这样才叫相似推导相似。在这道题目中，显然不是相似推导相似，所以应该是一个因果推理。

cherryfish1209

Helr 发表于 2014-5-4 12:25
在很多GMAT考试题目中，都具有两个东西比来比去。但是请注意，并不是两个东西比较就是类比推理。类比推理的 ...

谢谢解释！