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题库 / Prep2007E2-CR-36
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?
Air Dacentaria's flight from Pederton to Dacenta is nonstop, whereas Southern Airways' flight touches down in Gorinda on the way.
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.
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.
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
Although the frequency of accidents is greater on Southern Airways, on both airlines the proportion of flights that have accidents is very small.
far worse 不是far less，看错题了
A提供了选择该航班的另一个原因，但没有反驳文中的结论：from Pederton to Dacenta，Dacentaria比Southern安全
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.
句子分析
只看主干
m SA flights uses s airport which is。the most dangerous but。not P to D
类比题
因为记录显示SA没有AD安全，所以要选AD
找出一个SA可能会比AD更加安全的理由
选错是因为没看懂b这句话，，，，
哭
cr--对比选最优
E：although the proportions of accidents is small, SA may still have a greater accident rate than AD. thus his conclusion still holds, AD is safer。所以E 并不能削弱该选项。
还是得对比选出最优的，be，b道出了 整体不安全不代表某条航线不安全，给出了不安全的原因以及航线相对安全的原因
e, 频率S高，但事故概率一致→S更危险
b, P到D安全，因为不经过最危险的机场 → 避开了危险因素（提出了为什么S的事故率高）
长难句训练：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.
its指代单数，那不能指代南航的flights，它是复数；its mountainous location 说明指的是机场而不是航线从P到D，所以its只能指代Sarmouth airport。
大部分南航航线都要使用Sarmouth airport，那是全世界最危险的机场-->南航事故率高并不是因为驾驶技术不好二是因为Sarmouth airport的关系；现在P到D的航线不用这个机场了，自然是安全的航线，用不着多花钱坐D家的飞机。
D，只在过去的几年里，从P到D的航班才D家的比南航的贵，意思是再远几年，两家的票价是一样的；同时也不能说明D的更贵的票价没有被用到增加航班安全上。属于无关选项。
原文开头提到了Southern Airways 有far worse safety record。
题目的关键是说，选择PtoD的航线上选择Air Da，因为更安全。原文有逻辑错误， B，指出了作者的一处逻辑错误，即整体的不安全不等于某条航线的不安全。
还是得比较
为什么选B呢？
这题因果题。削弱可以说A不一定比S危险或其它因素对S不利。
B项说S在其它航线中有危险机场，但旅客选的依然是P到D的行程啊。感觉A更像。因为S比A耽误时间，对S不利。
这道题关键在于safety，跟花费的时间无关
B说明目前的safety records并不能说明SA比AD更安全，削弱traveler的argument
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E：although the proportions of accidents is small, SA may still have a greater accident rate than AD. thus his conclusion still holds, AD is safer。所以E 并不能削弱该选项。