狒狒逻辑23－飞机倒底scheduled否？？？？？？

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.

参考答案：A 采用取非法。

思路：否定More than one or two airplanes were scheduled for
the 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。

一个是航班：flight

一个是飞机：airplane

关系是飞机（airplane）执行飞行任务（航班flight）。

题目说，S不可能一天有超过两个以上的班次（flights）会出现机械问题

所以：结论说有其他原因

问assumption

排除一种可能，9个航班（flights）的飞行任务只有两架或者1架（airplane）执行

那么如果这2架飞机出现机械问题，那么9个航班确实会有同时被取消的可能，这样的话，那就确实是机械问题了。结论被削弱

所以答案是A.(从另外一个方面想，如果9个航班由9架飞机执行，那么9个航班同时被取消的话，那的确不太可能是机械问题了，也从正面加强了结论。)