求牛人讲解 feifei上面一道CR题目

liuxinqi8811

23. On a certain day, nine scheduled flights on SwiftAirlines were canceled. Ordinarily, a cancellation is due to mechanicalproblems with the airplane scheduled for a certain flight. However, since it isunlikely that Swift would have the mechanical problems with more than one ortwo scheduled flights on a single day, some of the nine cancellations wereprobably due to something else.
The argument depends on which one of the following assumptions?

A.     Morethan one or two airplanes were scheduled for the nine canceled flights.
B.      SwiftAirlines has fewer mechanical problems than do other airlines of the same size.
C.      Eachof the canceled flights would have been longer than the average flight on SwiftAirlines.
D.     SwiftAirlines had never before canceled more than one or two scheduled flights on asingle day.
E.      All ofthe airplanes scheduled for the canceled flights are based at the same airport.
答案是A

tiny106

恩， 这道题是说在某天，SA的9个航班被取消了。一般来讲，取消航班是因为飞机机械故障。但是，因为不太可能同一天有多余2个航班出现机械故障，所以是因为其他原因出现才导致了航班取消。
A  9个航班是由两架以上飞机来承担的
本题的一个GAP就是为啥不太可能有多余两个航班出现故障，因为如果是一架飞机9个航班的话，是很有可能得啊。而A补充了这GAP。
其他选项：B，作者没这个意思，题中没出现比较。
         C，同B，也没有什么航班长短的比较
         D，作者也没这个意思，以前取不取消和作者推论没关系
         E，也是无关。