费费逻辑23

girlwithwings

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。

我的理解是——有9个航班被cancled, 一般来讲取消是因为飞机故障，但一般不会超过1-2架飞机出现这种问题，

所以应该有别的原因。

首先对A选项的理解。A选项：9个取消的预订航班中有超过1-2个的预订航班？？？不理解什么意思。而且觉得这句怪怪的。本来9 就大于 2 啊。

取非---如果没有超过1-2个的预订航班的话，就没有别的原因？？？ 也不一定啊！！！

请帮分析。

croustillant

我是这么认为的

超过2架飞机同时有机械故障是不太可能的。--原文说

所以文章的前提说是9架被取消航班的飞机中，有超过2架飞机---所以有别的原因，因为超过粮价飞机同时故障不可能。。。

这里提到的scheduled不是预定的意思，我觉得是安排。

irisdelis

lz需要弄清楚一个区别：flight与airplane，前者是指的航班次，后者指飞机

题干是说的 一天之内航空公司同时有两架“飞机”出机械故障不可能，而某一天内有9个航班被取消

所以assumption是 这9个航班用的飞机超过 2个，即答案a

想想：如果9个航班次用的是同一架飞机，那么题目结论是不成立的

girlwithwings

是的是的，

我就只是一位每个航班理所当然一架飞机。（想当然了！！！)