有时候逻辑的答案真是匪夷所思。

foreverdr

Traveler:  Southern Airways has a far worse safety record than Air Dacentaria over the past few years, in terms of both the frequency of accidents and the severity of accidents.  Therefore, although Air Dacentaria is slightly more expensive, I will choose it over Southern Airways for my flight from Pederton to Dacenta, since it is worth paying extra to have a safer flight.

Which of the following, if true, casts the most serious doubt on the traveler's argument?
1。Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.
2。 Most Southern Airways flights, but not its flight from Pederton to Dacenta, use Sarmouth airport, which because of its mountainous location is one of the world's most dangerous.
3。 For its flights from Pederton to Dacenta, Southern Airways uses a different model of airplane, with a smaller capacity, than the model Air Dacentaria uses for its flights on the same route.
4。 Only in the last few years has the cost of flying from Pederton to Dacenta been more expensive on Air Dacentaria than on Southern Airways.
5。 Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.
此题答案是B 我选的E    这B怎么理解　怎么选的？

wudiyeah

WEAKEN题，此题答案用他因法解。
即导致Southern Airways 的事故比Air Dacentaria 多的原因是因为机场地形本身比较危险。但旅客所要搭乘的航班除外（并不使用那个机场）。——通过其他原因解释了造成Southern Airways 事故多不安全的表象。

逻辑题里凡是涉及比较的，很多都是通过对A、B两个事物的某一特定方面进行比较，而推出A优于B之类的结论。而我们要牢牢记住，这样的结论要永远建立在这个前提上——这两个事物的其他方面必须同质或相似，才能评出个孰优孰劣。

LZ可以通过这个原则重新思考一下这题。

melvinperson

支持楼上说的：很多都是通过对A、B两个事物的某一特定方面进行比较，而推出A优于B之类的结论。而我们要牢牢记住，这样的结论要永远建立在这个前提上——这两个事物的其他方面必须同质或相似，才能评出个孰优孰劣。

太对了！这是我的理解

削弱题 结论：S公司比AD公司事故多。

A选项 无关选项
B选项 是机场的原因（外因）导致的S公司的航班比AD公司的航班事故更多，而不是S公司本身自己的原因导致的。同时，从P到D的飞机不用危险地机场，所以会比较安全。两次削弱了结论。
C选项 无关
D选项 无关 结论是事故问题 于cost无关
E 感觉好像没有B削弱的强烈

vivianxiong

很受用！