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 profitable crop
答案选的D，这道题我咋觉得没一个选项看着顺眼的啊 ABCE我也知道都不对 D中，要是most of the farmers who tried the genetically modified corn last season applied more insecticide than was actually necessary ，是加强了原文观点，说明使新基因corn的costs更多，但是反过来most of the farmers who tried the genetically modified corn last season did not applied more insecticide than was actually necessary ，那不是什么都说明不了么？请各位大牛帮着看看！谢谢~~作者: yorku 时间: 2012-5-28 06:43
