[求助]feifei-23

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.

答案是A否定它不能削弱阿，求思路

好象懂了,但是题目不是说nine scheduled flights吗?已经说定了的,还能把他否了?请指教!

最近好想有点苯~~

我是这样理解的~

这一题重点在于第一，一般航班取消都是因为飞机出了机械故障；第二，在同一天内不可能有两个以上的航班的飞机出现机械故障；然后来看a选项，那一天的9个航班用了2架以上的飞机。你想想，如果那9个航班都是用2台飞机，那么我们有理由说这9个航班的取消都是因为那两台飞机故障；但是如果那9个航班用了多余2台飞机，而又不可能一天之内有有2台以上的飞机出故障，那么这9个cancellation里面肯定有除了机械故障以外其它的原因。

希望对你有帮助！

明白两架飞机可以飞9个航班 我认为是解决此题的关键

谢谢楼上

对哦!flight和plane不是一回事!恍然大悟,谢谢番茄笑了,西西