Help: a CR from Feifei logic

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.

I totally have no idea on this question. The correct answer is A. I looked up the explanation but still cannot understand it.

The explanation:

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。

E：无关。

Who can help to give a detail explation....?

Many many thanks.

这题是说，S航空公司一天里取消了9班航线。通常航线取消都是因为那条航线上的飞机出现机械故障，但是因为在一天时间里在两条或两条航线以上出现机械故障是不太可能的，因此取消的这9班航线里肯定有出于其他原因取消的。

假设这九班航线其实就是只有一架或两架飞机，往返飞来飞去，那如果这一两架飞机出现机械故障，就会造成这9班航线全部取消了。这种情况下，题目的结论（即这9班航线里肯定有出于其他原因取消的）就不成立了。所以要使结论成立，必须是有A这个假设，即这9条航线里不只一、两架飞机。正因为不只一、两架飞机，而超过两架飞机在同一天里不太可能同时出机械故障，才能得出题目里的结论，即出现了其他原因导致9条航线取消。

哦,看来我一直没有搞明白题目其实说了两个概念, airplane和flight.

一个airplane可能对应多个flight,对吗?如果这个airplane取消,那么由它来执行的所有的flight随之取消.

只有More than one or two airplanes来运行九个flight,那么因为其他原因取消航班的假设才成立的.

我应该是明白了.可是我还是不明白为什么要用取非这个做法来解题....一取非我就犯晕,不取非我还明白,呵呵

谢谢你的解答

你的理解没错了!

其实我觉得,很多逻辑参考书统计什么"取非"之类的规律,虽然是为了归纳些方法帮人解题,但是如果陷进去了反而适得其反.我其实对什么取非,排除一窍不通,也从来没有研究过.我觉得做逻辑最重要就是两点,一个就是搞清楚题目意思,再一个就是分析.比如这题,你开始就是因为没搞清楚题目的意思,即airplanes和flights是两个概念,所以才没头绪,所以还是要多注重理解题意啊,呵呵.

嗯,是的,做了几个狒狒逻辑的session,发现错误的题目有一半以上是由于自己没有理解题意造成的!

看来阅读能力在做逻辑题的时候起到了很大作用啊.

顺便问一句,狒狒逻辑越往后的session是不是越难?我越往后做错的越多了.....

后面的主要都是asumption和infer难题了。。不过感觉和OG上的题不太一样。。反正是很难