[讨论]feifei逻辑宝典第23题

luoallie

23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.

The argument depends on which one of the following assumptions?

A.       More than one or two airplanes were scheduled for the nine canceled flights.

B.        Swift Airlines has fewer mechanical problems than do other airlines of the same size.

C.        Each of the canceled flights would have been longer than the average flight on Swift Airlines.

D.       Swift Airlines had never before canceled more than one or two scheduled flights on a single day.

E.        All of the airplanes scheduled for the canceled flights are based at the same airport.

为什么答案是A呢？

[此贴子已经被作者于2008-1-23 16:03:19编辑过]

寄居蟹

因为it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day，所以如果没有别的原因，就不应该有多于1-2个schedualed flights有机械问题。而题目直接得出结论：一定有别的原因。只有在多于1-2个schedualed flights有问题的情况下才能得出这个结论