OG一道题不解！！！！

HelloSusy

Scientists have modified 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 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 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


D选项说是否尝试使用genetically modified corn的相比平时使用了更多杀虫剂
解释是：如果多于，那么就加强了观点，如果少于就削弱了观点
可是文中说他们省下来的杀虫剂的钱极少超过他们在新种子上花的钱啊，那么削弱的那一个不就成立不了，不能削弱了吗？

vivi00

what these farmers saved on insecticide rarely exceeded their extra costs for seed.
说这些farmers之前在杀虫剂上节省的钱没有超过在新种子上的花费，所以如果farmers本可以使用较少的杀虫剂，那就说明使用杀虫剂是可以节省成本的呀

masaki006

楼主是不是没仔细看选项，好像GWD里有一道题是相比平时，但本题是than was actually necessary
如果按需求只需要喷10块钱的药，结果实际操作喷了100块的药，这90是不必要的花费，扣掉后再去和买种子的钱比才能evaluate结论合不合适呀

HelloSusy

masaki006 发表于 2016-6-10 14:45
楼主是不是没仔细看选项，好像GWD里有一道题是相比平时，但本题是than was actually necessary
如果按需求 ...

ok!!!我明白啦，这里的意思是说可能那些种新的种子的农民不小心可能喷多了农药，所以他们才得出在农药上省下的钱没有买种子多花的钱多。D就是那些农民可能喷多了农药。对吗

masaki006

嗯嗯，我就是这个意思