请教一道有争议的逻辑题。（自己对这道题已有一点想法）

molynca0717

Scientists have made genetic modifications to cotton to increase its resistance to insect pests. According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not. Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.
Which of the following would it be most useful to know in order to evaluate the argument?
A.    Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed.
B.    Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops.
C.    Whether for most farms who grow cotton it is their primary crop
D.    Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did.
E.    Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide.

做PREP时候系统给的答案是B，所以我不怀疑其正确性。
以下是我的思路请大家帮看一下对不对：
【题干】转基因种子有抗虫性，但是实践发现转基因棉花种子所用杀虫剂只比普通棉花种子少一点，而前者的价格要比后者高同时产量不变。那么要不要使用这种转基因种子呢？
【B】考察是否给棉花种子用的杀虫剂要比给其他农作物用的贵？假设很贵，那么即使只是少用一点农药，也能省不少钱。（对）
【E】考察是否大多数尝试使用转基因种子的人以前使用了大量的杀虫剂？假设大量使用，但由于不知道杀虫剂的价格，所以无法判断。（错）

爱吃巧克力

哇塞好难。。。可是省不省钱关other crops什么事，想不通

sdcar2010

LZ's analysis is to the point.

Summer明明

这题是纠的么。。。我觉得应该比较转基因种子更贵的价格与杀虫剂少用的价格（虽然至少用一点点）
B 就算杀虫剂价格和其他crop一样，也不一定节省的钱一定小于种子贵的钱
额 我觉得B的逻辑也不完整，不过纵观选项也只有B跟价格有关了，勉强选B把。。。

Zacks

LZ对E选项的分析让我茅塞顿开啊~（其实是自己傻啊！自己看B时知道考虑“价格”，看E时却把“价格”扔了）帮顶~

shadalex

记得OG上给的答案是E。。到底是按哪个来呢。。

可卡其蓝

OG上那道题是84题吧？那道题同是说转基因的东西，但是题目不一样的，你仔细看~！

jackie19881102

哇塞好难。。。可是省不省钱关other crops什么事，想不通

-- by 会员 爱吃巧克力 (2011/3/5 19:13:25)

看清楚，是insecticides used on other crops，不要简单地就看到other crops，所以比较的还是insecticides

弥小岛

可是另外一说答案是D  到底哪个是对的
D其实也说得通  就是规模效应嘛  

北冰洋不是洋

弥小岛 发表于 2016-7-17 23:53
可是另外一说答案是D  到底哪个是对的
D其实也说得通  就是规模效应嘛

应该选D

B是比较的是杀虫剂用在ordinary的crops上和杀虫剂用在other crops上的比较 但是这里没有other 所以不对
E是说因为原来用的杀虫剂量大 但量大不代表cost大 所以也不对
D是说种的面积是一样的 如果种的面积不一样 就不能说benefit是不是比他小了 但是面积是一样的 就证明benefit就是小了