Critical Reasoning
试题详情
题目：
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?
Which of the following would it be most useful to know in order to evaluate the argument?
选项:
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 few years
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
答案:
D
提问：
请问张慧雯老师，本题我觉得他主要是围绕these farmers saved on insecticide rarely exceeded their extra costs for seed.杀虫剂的成本去谈，然后我就选了c 感觉他就是拿不同种类的corn的杀虫效果去比较，请老师指出我的问题。
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提问：
此题的正确答案的解释。说用了modified corn他们得到了更高的profit。可是选项明明说他们用了更多的杀虫剂。这不应该增加了成本 profit更低了吗？这并没有weaken argument。[img=/resource/2017-06/13762-1496592694.jpg]
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