prepCR2 36 含泪求助。

小鱼1988

36.    (31643-!-item-!-188;#058&006431)

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?

(A) Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.
(B) 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.
(C) 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.
(D) 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.
(E) Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.

这题选的B，想问问各位，因为我怎么觉得B是无关选项啊。

jedylxl

我觉得B的意思是SA之所以事故多是因为使用了危险的机场，但这条航线没有用，所以该航线不比AD危险。
不知对否

小鱼1988

貌似有道理。。。。。。

sugaryun

首先判断这是一道削弱题(cast doubt), 我们要选出来的选项时要使结论成立的概率下降。
结论是什么？结论是南方航空比D航空危险，我要选D航空。

看B选项，说的是南方航空事故高发的原因是使用了危险的机场，而我要乘坐的这条航线没用这个机场。
带回结论再看，说明B选项是一个他因型的削弱。

andreasyang

那么明显的B。。。

像风一样离去

我觉得不明显啊，如果事故一个是50年一次，一个是40年一次，那么这么低的概率，然后消费者说it's worth paying extra to have a safer flight不是没有必要么？