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题库 / Prep2008E1-CR-106
Trancorp currently transports all its goods to Burland Island by truck. The only bridge over the channel separating Burland from the mainland is congested, and trucks typically spend hours in traffic. Trains can reach the channel more quickly than trucks, and freight cars can be transported to Burland by barges that typically cross the channel in an hour. Therefore, to reduce shipping time, Trancorp plans to switch to trains and barges to transport goods to Burland.
Which of the following, if true, casts most serious doubt on whether Trancorp's plan will succeed?
It does not cost significantly more to transport goods to Burland by truck than it does to transport goods by train and barge.
The number of cars traveling over the bridge into Burland is likely to increase slightly over the next two years.
Because there has been so much traffic on the roads leading to the bridge between Burland and the mainland, these roads are in extremely poor condition.
Barges that arrive at Burland typically wait several hours for their turn to be unloaded.
Most trucks transporting goods into Burland return to the mainland empty.
情景：Trancorp现在都是用卡车向Burland运输物资。现在发现火车和驳船运输的速度要比卡车更快。因为，为了减少运输时间，Trancorp打算用火车和驳船来向Burland运输物资。
推理：推理文段给出了一个方案，即，Trancorp plans to switch to trains and barges to transport goods to Burland。问题让我们削弱方案是否能达到预期的效果，因此文段的推理方式为：方案推理。
本题的推理结构为：
目标：To reduce shipping time
方案：Trancorp plans to switch to trains and barges to transport goods to Burland
选题方式：方案推理有三个评估方向，简而言之，即，答案选项一定和方案的内容相关。
选项分析：
A选项：用汽车送货到Burland不会显著的比用火车或者驳船送货到Burland贵。如果用汽车送货更贵，则
B选项：在未来的两年内，通过到达Burland的桥来到达Burland的汽车数量将会上升。汽车数量上升和方案无关。
C选项：因为有太多的汽车走大桥了，所以那些路的状况都很差。本选项解释了汽车为什么会速度慢，但是和方案无关。
D选项：Correct. 到达Burland的驳船需要等很长的一段时间来卸货。本选项给出了方案的可行性问题，其表示方案有可能无法达成减少时间的目的。
E选项：大部分的送货到Burland的汽车都会空车返回。汽车是否会空车返回和方案无挂你，可以排除。
freight cars can be transported to Burland by barges that typically cross the channel in an hour，这个前提为真的情况下，汽车交通情况就不需要考虑，因为一定是在1个小时内就可以完成的。所以这个理由无法攻击。
有犹豫选项的时候一定多看看原文premise。