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The difficulty with the proposed high-speed train line is that a used plane can be bought for one-third the price of the train line, and the plane, which is just as fast, can fly anywhere. The train would be a fixed linear system, and we live in a world that is spreading out in all directions and in which consumers choose the freewheel systems (cars, buses, aircraft), which do not have fixed routes. Thus a sufficient market for the train will not exist.

Which of the following, if true, most severely weakens the argument presented above?

正确答案: C

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OG13 CR112 请NN指教下 削弱题可不可以否定premise?

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发表于 2013-4-18 11:17:16 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
112. The difficulty with the proposed high-speed train line is that a used plane can be bought for one-third the price of the train line, and the plane, which is just as fast, can fly anywhere. The train would be a fixed linear system, and we live in a world that is spreading out in all directions and in which consumers choose the free-wheel systems (cars, buses, aircraft), which do not have fixed routes.Thus a sufficient market for the train will not exist.

Which of the following, if true, most severely weakens the argument presented above?

(A) Cars, buses, and planes require the efforts of drivers and pilots to guide them, whereas the train will be guided mechanically.

(B) Cars and buses are not nearly as fast as the high-speed train will be.

(C) Planes are not a free-wheel system because they can fly only between airports, which are less convenient for consumers than the high-speed train’s stations would be.

(D) The high-speed train line cannot use currently underutilized train stations in large cities.

(E) For long trips, most people prefer to fly rather than to take ground-level transportation.

这道题的正确答案是C。其实在选择的时候根据感觉也一下子就能选出来,但知这C是不是直接说文中premise的信息有错误呢?削弱不是不应该说premise本身的错误吗? 这里怎么回事呢?

先谢过啦 : )
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发表于 2013-7-20 17:49:56 | 只看该作者
trasy 发表于 2013-7-20 16:02
这个题目有两个疑问,
第一是:Conclusion应该是 a sufficient market for the train will not exist 还是O ...

2个疑问结合起来说:

weaken the argument 。要知道argument是整个题干的逻辑思路,而不是conclusion,这是CR的一个核心问题。 有的问题会让你weaken conclusion,有的问题要你weaken argument,我觉得这是不一样的。

因此 这题的argument是: 前提1:飞机比火车便宜 前提2:飞机是free-wheel sys 而 火车是fixed linear sys,现在人们都选择free-wheel的          结论:火车没市场

weaken这个argument,我们就要让前提推不出结论,而不是结论被消弱(我一开始就是削弱结论 TAT)
因此只要指出,飞机也是fixed sys而不是真正的free-wheel(因为free-wheel是指真正的到任何地方,就像汽车,而飞机必须去飞机场)
沙发
 楼主| 发表于 2013-4-18 20:21:50 | 只看该作者
up up up up up
板凳
 楼主| 发表于 2013-4-19 10:00:51 | 只看该作者
地板
 楼主| 发表于 2013-4-20 09:16:01 | 只看该作者
up up up up up up up
5#
发表于 2013-4-21 00:17:49 | 只看该作者
亲~ 又看到你了哈~ 我来试着答一下。

这题的逻辑链应该是:
Premise 1: used plane has lower price than train line, and plane can fly anywhere
Premise 2: train has fixed linear system, but we live in a free-wheel systems
Conclusion: a sufficient market for the train will not exist.

文中从premise推出conclusion,作者用train line和plane做比较,认为plane可以fly anywhere但是train是fixed line,以此说明plane比train有market,推出train的sufficient market不存在。
其实在推理中存在一个assumption:plane has free-wheel system (plane can fly anywhere)。正因为plane has free-wheel system, but train has fixed line system, 所以plane比train强。

C选项的weaken方式其实是exposes a faulty assumption. 如果说Planes are not a free-wheel system,那我们的assumption不成立,assumption不成立就说明想用是否是free-wheel system来推出sufficient market这个推导是不成立的.
所以这题其实并不是对premise的削弱,而是对其中的assumption进行削弱。只是需要我们把这个assumption理出来。
6#
 楼主| 发表于 2013-4-22 19:12:11 | 只看该作者
mamaliang 发表于 2013-4-21 00:17
亲~ 又看到你了哈~ 我来试着答一下。

这题的逻辑链应该是:


嘿嘿 谢谢海绵~ 我这两天都没有上 所以才看到
你说的意思 我明白啦 我当时大概也是像你这么推理的
但是啊 我这题最大的问题在于 这个"airecraft belongs to the free-line system"并不是hidden的呀!因为原文中在premise中实在的说了"in which consumers choose the free-wheel systems (cars, buses, aircraft)"所以我才疑问,这怎么否定原文给出的事实呢!(是不是好钻牛角尖T T)
7#
发表于 2013-4-22 20:55:27 | 只看该作者
同疑惑中··
8#
发表于 2013-4-22 21:33:16 | 只看该作者
亲,你看的很仔细啊~~ 好样的~~
我又看了一下OG13答案的解释,然后在网上查了一下啊,确实airplane和aircraft有些区别。
airplane是指一些普通飞机(包括commercial airplane,就如答案里面说的),但不包括直升飞机。
aircraft就包括直升飞机一类的了。

所以。。这个要是纠结起来真的是很纠结呢。~~ 我觉得只要我们把握了做题思路,这些就不纠结了吧~~
9#
 楼主| 发表于 2013-4-22 21:41:02 | 只看该作者
mamaliang 发表于 2013-4-22 21:33
亲,你看的很仔细啊~~ 好样的~~
我又看了一下OG13答案的解释,然后在网上查了一下啊,确实airplane和aircra ...

OMG! 好吧! 那我就屈服吧,还是别太挣扎了。哈哈。
谢啦!
你也加油!!!
我在看CR PREP : D
10#
发表于 2013-4-22 22:10:04 | 只看该作者
Hugateddybear 发表于 2013-4-22 21:41
OMG! 好吧! 那我就屈服吧,还是别太挣扎了。哈哈。
谢啦!
你也加油!!!

嗯嗯!!
我的CR还在做OG~~ 我要加油啦~~ 争取和你同步!
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