OG12 69

lijundkj

69. Scientists have modifi ed feed corn genetically, increasing its resistance to insect pests. Farmers who tried out
the genetically modifi ed corn last season applied less insecticide to their corn fi elds 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 modifi ed seed would be unlikely to increase profi ts.
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 modifi cation 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 modifi ed corn last season applied more insecticide
than was actually necessary
(E) Whether, for most farmers who plant feed corn, it is their most profi table crop

答案是To answer a question such as this, one should look for information that would strengthen or weaken the argument.
If one had information that the farmers growing the genetically modifi ed corn could have increased their yields last year at lower cost, this would be helpful in evaluating the argument, because this would show that the argument is weak

这题的逻辑链究竟是什么 答案不太懂啊~~ 高人指点啊

genius_fang

说一种转基因的玉米，可以抵抗害虫，减少使用农药。但是由于价格要比普通的贵。由于减少农药省下来的钱和买种子多花的钱差不多，而产量也大致一样，所以种这种转基因的玉米并不能带来更高的利润。
答案的意思是说：农民想要获得更多利润，可以通过降低成本的方法。而D就是一个降低成本的方法。D说：去年用在转基因玉米上的农药是不是太多了。如果回答是，那么现在就可以少用农药，成本自然就下来了~

lijundkj

哦~~明白了 题目把我绕昏了  谢啦~~