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.
曾经问过，但是始终没弄懂，请再指点，谢谢！
1. 如果只有一架飞机承担了9个航线的飞行, 并且是这架飞机出现了机械故障, 那不就可以推出这九个CANCELLATION都是由这一个原因造成而无其他原因了吗? 如果是这样的话, 就与原文推出的结果相反了. 所以A正确.
2. 其他的选项都不想关, 用排除法都能解决掉.
1. 如果只有一架飞机承担了9个航线的飞行, 并且是这架飞机出现了机械故障, 那不就可以推出这九个CANCELLATION都是由这一个原因造成而无其他原因了吗? 如果是这样的话, 就与原文推出的结果相反了. 所以A正确.
2. 其他的选项都不想关, 用排除法都能解决掉.
差不多吧, 关键还是要理解题意.
it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day
这句话本身就隐含一个假设：不能是同一个飞机。
A排出这个可能
good question.
try to confuse by mixing up "flight" and "plane".
题目是不是应该把more than one or two scheduled flights改成more than one or two airplane啊？这样的话就是：more than one or two airplane推出not mechanical problem，从ASSUMPTION A推出nine scheduled flights not mechanical problem
2,5楼说的好，赞！
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