费费逻辑23题不懂~ 求解释~~~

楠楠joanne · 发表于 2012-3-3 16:53:24

23. On a certainday, nine scheduled flights on Swift Airlines were canceled. Ordinarily, acancellation is due to mechanical problems with the airplane scheduled for acertain flight. However, since it is unlikely that Swift would have themechanical problems with more than one or two scheduled flights on a singleday, 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 airplaneswere scheduled for the nine canceled flights.
B. Swift Airlines has fewermechanical problems than do other airlines of the same size.
C. Each of the canceled flightswould have been longer than the average flight on Swift Airlines.
D. Swift Airlines had never beforecanceled more than one or two scheduled flights on a single day.
E. All of the airplanes scheduledfor 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 forthe 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。

kevingod · 发表于 2012-3-3 17:04:36

A选项 more than one or two，不妨假设有三架被指派给九个flights,因为文中说“since it is unlikely that Swift would have themechanical problems with more than one or two scheduled flights on a singleday”所以不可能是三架飞机都出问题，所以还有其他问题，得出结论。
对more than one ot two取非，假设就一架飞机被指派被九个航班，那么“since it is unlikely that Swift would have themechanical problems with more than one or two scheduled flights on a singleday”这句话就失去作用了，取消的原因完全可能就是因为这一架飞机导致的，所以不能得出上面的结论。

费费逻辑23题不懂~ 求解释~~~

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