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.
LS曾经解释过（dreambuilder），可是还是不明白为什么选A。
具体的解题思路是什么呀？(FF给与的解释很含糊）谢谢！作者: mvmv90 时间: 2010-4-2 07:08
FF：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。
是否可以通过搭桥法，将两个主题（红字的主题联系到一起）：
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.
原Argument解释说是因为机械故障，However否定原Ar后，解释不可能有超过one or two schedule flights on a single day， =>Conclusion：有“其他原因”引起的cancellation。如果Conclusion成立，条件是more than one or two scheduled flights on a single day 不会出现，所以在一天内可以有更多的More than one or two airplane be scheduled to the nine cancellations
不过这种推理是看了答案后才这样想的，确实不知道出题人的思路和目的是什么？
还希望继续讨论作者: augest 时间: 2010-4-5 07:21
关键是看结论前面的这句话：However,作为转折， since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day,从而得出结论： some of the nine cancellations were probably due to something else.
这个就是引子。
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