对asumsion题，取非后出现与原题目限制的条件矛盾怎么办？

dxychristy

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.
    

大家都说对a取非，但取非后就是只有1，2 架飞机were scheduled for the nine canceled flights.那么就可能是这1，2 架飞机出现事故导致nine cancellations ，而不是别的条件！ 但题目条件： 不是说了Swift 不可能出现两次航班以上的有机器事故的情况马？ it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day。 那为什么还对a取非

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.
    

大家都说对a取非，但取非后就是只有1，2 架飞机were scheduled for the nine canceled flights.那么就可能是这1，2 架飞机出现事故导致nine cancellations ，而不是别的条件！ 但题目条件： 不是说了Swift 不可能出现两次航班以上的有机器事故的情况马？ it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day。 那为什么还对a取非

[此贴子已经被作者于2007-7-30 1:08:31编辑过]