OG12 CR69

croustillant

69.     Scientists have modi?ed feed corn genetically, increasing its resistance to insect pests. Farmers who tried out the genetically modi?ed corn last season applied less insecticide to their corn ?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 modi?ed seed would be unlikely to increase pro?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 modi?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 modi?ed corn last season applied more insecticide than was actually necessary

(E)     Whether, for most farmers who plant feed corn, it is their most pro?table crop

答案是D，我选B。feed corn和genetically modi?ed corn价钱应该不一样啊，为啥OG答案说Whether prices of feed corn go up or down a?ects the comparison groups equally.而且为啥选D我也不理解，希望谁能给我解释一下。万分感谢

patrickman

daisysnail 发表于 2015-6-22 22:02
我也没看太懂A，但能看出是在讲insect pests的事情，和钱没有关系，所以就排除了 ...

同意！               

我要喝可乐

daisysnail 发表于 2015-6-22 22:02
我也没看太懂A，但能看出是在讲insect pests的事情，和钱没有关系，所以就排除了 ...

我认为A说的是ineffective，题目的结论是关于profit，所以应该是无关。

daisysnail

第一次没有考虑D，因为认为用量是既成事实无法改变。而题目问的不是评价已发生的事leads to已知的结果是否合理，而是问评价根据已发生的事leads to将来的结果/预期是否合理。
那么D就合情合理了。

daisysnail

我也没看太懂A，但能看出是在讲insect pests的事情，和钱没有关系，所以就排除了

ItGirl

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
是否存在一些虫子有时候是会减少谷物产量的，而且能抵抗普通常用的杀虫剂和那些基因修饰谷物（即基因修饰谷物也对害虫不起作用）？

这是我从另一个网上看到的人家的解释。

如果有这样的虫子，作用在转基因种子和正常种子上是一样的，也就是说，两种种子产量还是一样的。于是对于转基因玉米是否会赢利多余普通玉米这个问题上是无关的。

hanyichen

我是真心有个人回复我一下这个问题啊， 我对A 是这么理解的，有一种害虫（有些时候会减少f-c的产量），但是普通杀虫剂和Genetic modification 是否对抗它是同样有效的？
回答是：就是同样有效的，既然同样邮箱有效就对原文结论起到支持作用。
回头否：就是不是同样有效的。 可是，“不是同样有效“ 的意思是说 要不C的效果大于G， 要不G的效果大于C。得不是任何结论

lan0604

3楼对A选项的理解错了

ppher

与LS同问