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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 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    但感觉不到有联系 

A该怎么理解

题目是说， 航线取消通常是由于特定航线的飞机有问题，然后，那天有9条航线取消，但不可能，有超过2条航线同一天出问题的，所以有其他原因。

题目开始说飞机，后来说航线，所以假定了那9条航线有超过2个飞机。反正，答案必须把飞机和航线联系起来。

我怎么觉得A是WEAKEN啊

more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.

More than one or two airplanes were scheduled for the nine canceled flights.

这样看是不是就不是weaken了

Maybe it is a little obscue.I still cannot get to grasp the essence of it?

如果9个航班都是用同一架飞机的话，那么这架飞机由于机器故障就会导致9个航班全部取消。但是题目是不肯有两个航线以上同一天出现机器问题，是其他原因。那么就必须是两架飞机或两架以上飞这9个航班。