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.
参考答案：A 采用取非法。
思路：否定More than one or two airplanes were scheduled for the nine canceled flights.将削弱作者的结论。
不是大牛人的理解： case： On a certain day, nine scheduled flights on Swift Airlines were canceled
conclusion：some of the nine cancellations were probably due to something else
evidence: Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day
Assumption: 如果没有more than one or two airplanes were scheduled for the nine flights, 那作者可能就会怀疑是机械问题造成航班的取 消。
那推理的假设是什么呢? 看最后一句话，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.
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发表于 2008-10-10 06:53:00
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