标题: 一道OG题的分析，对其中一个选项存在疑问，大家一起讨论讨论啊 [打印本页] 作者: mudiduange 时间: 2010-5-27 10:17 标题: 一道OG题的分析，对其中一个选项存在疑问，大家一起讨论讨论啊 111. The dif?culty 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 ?y anywhere. The train would be a ?xed 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 ?xed routes. Thus a suf?cient 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 ?y only between airports, which are less convenient for consumers than the high-speed train!fls 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 ?y rather than to take ground-level transportation.
此题，A、D、E可以首先被排除掉 剩下B和C C：是直接对题目论据（plane is free-wheel）的驳斥，可以weaken结论。 B:比较了汽车和火车的一个区别，那就是汽车没有火车快。个人认为也是有道理的。因为文章是通过比较火车与其他交通工具的区别，觉得火车是非free-wheel，所以得出结论火车没有市场。那么，如果选项中存在火车有的优点，而其他交通工具没有，则可以说明在这个特定需求上，火车是有市场的。而OG给出的解释是这个选项与题目所问无关，我就不是太理解，我觉得比较有关