OG12 111 标题长~~~~~上次不长完全没人理啊啊！！！！

yzisheng

The difficulty  with the proposed high-speed train line isthat a used plane can be bought for one-third the priceof the train line, and the plane, which is just as fast,can fly anywhere. The train would be a fixed linearsystem, and we live in a world that is spreading out inall directions and in which consumers choose the freewheelsystems (cars, buses, aircraft), which do nothave fixed routes. Thus a sufficient market for the train
will not exist.
Which of the following, if true, most severely weakensthe argument presented above?
(A)  Cars, buses, and planes require the efforts ofdrivers and pilots to guide them, whereas thetrain will be guided mechanically.
(B)  Cars and buses are not nearly as fast as thehigh-speed train will be.
(C)Planes are not  a free-wheel system becausethey can fly only between airports, which areless convenient for consumers than the high speedtrain’s stations would be.
(D)  The high-speed train line cannot use currentlyunderutilized train stations in large cities.
(E ) For long trips, most people prefer to fly ratherthan to take ground-level transportation.

我给翻译了一下，感觉应该没什么出入：
高铁线提议的困难在于高铁线所花价钱的三分之一就可以买个可以飞同样速度的还可以到处飞的二手飞机。火车被固定在线路系统里，而且在我们生活的这个世界我们要到处跑而且消费者选择可以到处跑的交通系统如汽车、公交车、飞机，而不是固定的线路。所以不再存在火车的市场。 问削弱
A 汽车、公交车、飞机需要司机但火车自动引导
C 飞机不属于到处跑的交通系统因为他只能在机场间飞，没有火车在车站间跑那么方便
答案选C，我选A。
答案说A和他说的那个到处跑系统无关
我说A直接削弱结论，证明了火车市场的可能，而且C说的那个和原文条件不符，他条件明明说飞机是那个到处跑系统的啊，感觉在自己抽自己嘴巴子啊！！！
求NN解释，我感觉我应该逻辑没什么问题但是和他们出题思路不太一样，想问问他们这帮人到底想要什么答案啊~~~~

CleoHellen

题目的中心是高铁的difficulty，而difficulty在于：一、plane line 与train line的price，二、plane 可以fly anywhere，而 train只能在 a fixed linear system

题目的结论是：a sufficient market for the train will not exist
原因是：以上两方面，加上we live in a world that is spreading out inall directions and in which consumers choose the freewheel systems (cars, buses, aircraft), which do not have fixed routes

要weaken结论，当然要weaken推出结论的原因，因此C是正确答案

shinell2009

帮顶一下，这道题我也一直没有弄明白~

wawalmx

对啊，削弱题嘛，我觉得最直接最有效的攻击方法就是说对方说的是错误的，不是自己打自己嘴巴子，而是你打他嘴巴子，不要扯一些其他原因。你说对吧？