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。
A：取非削弱
B：无关。
C：无关。
D：无关。
E：无关。
题干第一句话不是已说明了nine scheduled flights ，怎么还会有A中的九架中的两架是排了期的呢？请NN指点
1。 nine scheduled flights 指九个航班，不是九架飞机。
2。A的取非是 ONE OR TWO airplanes were scheduled for the nine canceled flights
3。现在明白为何A为何是答案了吧
这题还是不明白，哪位NN帮忙说的更具体些？要了解lawyer的意思，可能我在逻辑上还要多加把劲
就是一架飞机可以做4~5个航班。
9个航班由一到两架飞机来飞。
9个航班由一到两架飞机来飞？sorry，还是不懂，我好笨啊！！
文中是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。答案是 More than one or two airplanes were scheduled for the nine canceled flights，我怎么都不能将这两者构成联系。
每一个取消都是因为飞机在该FLIGHT上的机械故障的原因,既然一天内不会在超过两个的FLIGHT出现,说明一个飞机最多出现两个CANCELLATION. 所以出现了9个CANCELLATION 一定是超过了2架的飞机都出现了机械的故障.A 应该是加强结论的. 说实话,取非很难看的出来,我一般都看加强结论.
我做逻辑还是速度很慢.加油!
不明白
问！
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