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标题: GWD-NT-11 Q4 答案有没有错啊，请NN们指点 [打印本页]

作者: gmatbiguo 时间: 2011-5-8 10:00
标题: GWD-NT-11 Q4 答案有没有错啊，请NN们指点
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.
答案选B，但我觉得B实在比较cotton和other corps，和原文说的无关啊。我选了E，NN们你们怎么看这道题的？

作者: kikisunflower 时间: 2011-5-8 10:43
选B

line of reasoning:
科学家最初目的：培育转基因种子，对抗虫害

现状1：转基因种子每亩杀虫剂用量略小于普通种子每亩杀虫剂用量

现状2：转基因种子价格大于普通种子价格

现状3：转基因种子产出产品的价值不大于普通种子产出产品的价值

结论：使用转基因种子不比使用普通种子更实惠

argument里只是列出一些收入和支出的事实，根本就没有比较这些收入和支出的大小，怎么知道是收入>支出，还是支出>收入；

现状1：收入
现状2：支出
现状3：因为关系是“不大于”，所以先不管了，就比较上面两项的大小

现状2里面直接给出cost了，要比较的话，现状1也要知道cost，于是选B

E属于废话，农民选择转基因种子的动机和他们后来是不是有收益，没关系的。

作者: gmatbiguo 时间: 2011-5-8 11:48
如果比较的是转基因棉花和普通棉花杀虫剂的价格，我同意有evaluate的效果。但是比较的是普通棉花和其他农作物的杀虫剂价格，与原文结论：是否要使用转基因棉花，感觉不相关啊

作者: kikisunflower 时间: 2011-5-8 12:26
不要管是不是other crops，这里不管crop的事，我们只管农药的种类和价格。

比如，有A B C D E ……很多种农药
普通棉花用A农药
那转基因棉花用什么农药？
如果转基因棉花用A农药，我们比较cost，可以达到evaluate的目的
如果转基因棉花用B C D E其他什么农药（也就是题目中的insecticides typically used on other crops），我们还是比较cost，同样达到evaluate的目的

题目中说insecticides typically used on other crops，没有crops什么事儿，就是想说其他农药

作者: GmatMakeIt 时间: 2011-5-8 12:35
感觉就DE 还有看头..别的完全不对啊

作者: kikisunflower 时间: 2011-5-8 12:42
DE完全无关。。。

作者: kikisunflower 时间: 2011-5-8 12:49
楼主选E，能给一下推理吗

农民是因为以前用杀虫剂太多了，所以用了转基因种子，能推出什么？

农民是因为其他原因使用了转基因种子，能推出什么？

作者: kikisunflower 时间: 2011-5-8 12:50
这道题BBBBBBBBBBBBBBBBBB

insecticides typically used on other crops=other kinds of insecticides

crop是trick而已。。。。。。。。。。。。。。。。。

作者: gmatbiguo 时间: 2011-5-8 13:04

这道题BBBBBBBBBBBBBBBBBB

insecticides typically used on other crops=other kinds of insecticides

crop是trick而已。。。。。。。。。。。。。。。。。

-- by 会员 kikisunflower (2011/5/8 12:50:53)

不要激动，耐我再想想。

作者: GmatMakeIt 时间: 2011-5-8 14:42
。。。那么激动干嘛。。。受不了啊。。。。og有一道差不多的啊 B必然错的啊。。。。

作者: GmatMakeIt 时间: 2011-5-8 14:44
然后我真心觉得d啊。。。。

作者: gmatbiguo 时间: 2011-5-10 10:47

不要管是不是other crops，这里不管crop的事，我们只管农药的种类和价格。

比如，有A B C D E ……很多种农药
普通棉花用A农药
那转基因棉花用什么农药？
如果转基因棉花用A农药，我们比较cost，可以达到evaluate的目的
如果转基因棉花用B C D E其他什么农药（也就是题目中的insecticides typically used on other crops），我们还是比较cost，同样达到evaluate的目的

题目中说insecticides typically used on other crops，没有crops什么事儿，就是想说其他农药

-- by 会员 kikisunflower (2011/5/8 12:26:07)

谢谢，你说服我了！这道题是很triky

作者: hanshipeng 时间: 2011-5-10 12:20
标题: try
B. 此题就是比较用与不用的成本的问题。题目说，转基因的毕不转基因的单位英亩节省不了太多农药（但还是节省了）。而转基因的种子比普通的贵。
所以对这个问题的evaluation相关的。就是节省农药的钱（节省农药的量*价格）和买种子的差价的比较。
而B, 说的就是这个。即B.

作者: kikisunflower 时间: 2011-5-10 12:29
BBBBBBBBBBBBBBBBB

这不是激动，是无语

作者: kikisunflower 时间: 2011-5-10 12:42
GmatMakeIt，你如果是抱着讨论的心态的话，还是写一下你的思路吧。。。

作者: hanshipeng 时间: 2011-5-10 12:42
淡定，互相学习，教学相长！

作者: lianlianchen 时间: 2011-5-28 23:27
请功kikisunflower 参考一下OG12:
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
Argument Evaluation
Situation Farmers who grew feed corn genetically engineered to be pest resistant got yields
comparable to those of farmers growing ordinary feed corn, but did so while using less
pesticide. Since the amount saved on pesticide was rarely in excess of the extra costs for
the genetically modifi ed corn, most farmers will probably not increase profi ts by choosing
the genetically engineered variety.
Reasoning Which would be most useful to know in evaluating the argument? 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.
A It does not matter to the argument whether there are pests against which pesticides and genetic
resistance are equally ineff ective, because that is compatible with there being pests against which
they are not equally eff ective.
B Whether prices of feed corn go up or down aff ects the comparison groups equally.
C Th e relative cost of insecticides for other crops has no bearing on the argument because the
argument is concerned with only feed corn.
D Correct. Th is option provides the information that it would be most useful to know in evaluating
the argument. It shows that farmers growing genetically modifi ed corn last year could have
attained higher profi ts than they in fact did.
E Th e argument concerns only the relative profi tability of growing one variety of feed corn versus
another.
Th e correct answer is D.

作者: 沉湎 时间: 2011-6-4 11:23
我也觉得B选项有问题看了LZ贴的OG那题更坚定了这个想法

作者: ruirui_hsu 时间: 2011-7-16 16:49

这道题BBBBBBBBBBBBBBBBBB

insecticides typically used on other crops=other kinds of insecticides

crop是trick而已。。。。。。。。。。。。。。。。。

-- by 会员 kikisunflower (2011/5/8 12:50:53)

我也觉得B错。因为那个the other crops. 完全无关嘛
这里讨论的就是这种crop啊

作者: weijiejing 时间: 2011-7-16 17:23
B是无关的和other crops没有关系
D是正确答案如果用了新棉花的人没亩种的棉花比没用新棉花的人种的少或者多,那就无法根据他们用杀虫剂的量来判断新棉花在经济上的好坏了

B怎么可能正确...其它农作物的农药未必就能用在棉花身上, 所以这两种农药根本就没有可比性..

作者: bitterbeauty 时间: 2011-10-6 15:16

我也觉得B选项有问题看了LZ贴的OG那题更坚定了这个想法

-- by 会员沉湎 (2011/6/4 11:23:20)

OG的题和GWD这题有区别吧。
OG题干里已经说明：what these farmers saved on insecticide rarely exceeded their extra costs for seed. 而GWD这道只是说modified过的种子杀虫剂用量少了，但是并没说明价格，tatal=quantity*price, so B can evaluate the argument!
E选项，也只是强调了用量的问题。如果普通种子和modified seed用同种insecticide可以evaluate , 否则还是不行，从这里也说明了E不对。而B不存在这个flaw

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