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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 assumption?
(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.
d不对因为从前的情况和现在的情况没有什么联系。
而A选项如果取非，如只有一架飞机执行这九个航班，则只要一个机械故障就会导致这九个航班都会耽误（两架飞机各有一个机械故障，总共两个机械故障也是如此），此时原结论不成立。所以A选项为假设。
请指教。 |
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