OG第10版77题奇怪的flaw

crystal2003

77. A certain mayor has proposed a fee of five dollors per day on private vehicles entering the city, claiming that  the fee will alleviate the city's traffic congestion. The mayor reasons that, since the fee will exceed the cost of round-trip bus fare from many nearby points,many people will switch from using their cars to using the bus.

Which of the following statements, if true, provides the best evidence that the mayor's reasoning is flawed?

A. Projected increases in the price of gasoline will increase the cost of taking a private vehicle into the city.

B. The cost of parking fees alreaday makes it considerably more expensive for most people to take a private vehicle into the city than to take a bus.

C.Most of the people currently riding the bus do not own private vehicles.

D.Many commuters opposing the mayor's plan have indicated that they would rather endure traffic congestion than pay a five-dollor-per day fee

E. During the average workday,private vehicles owned and operated by pelple living within the city account for twenty percent of the city's traffic congestion

答案是B,

疑问1：B并不是mayor原因的flaw啊。 感觉这个题目如果通过答案来分析的话，倒像一个weaken题。

疑问2：flaw 类题的解题方法就是当weaken来解吗？

感激不尽！

lukrenee

解答第一个问题：市长想通过向私车收费限制入城私车的数量从而缓解交通压力，他的根据是收费超出公车车票费用，这样许多原来开车上班的人因为费用问题会转乘公车。选项B指出停车费本来就比坐公车高得多，即如果市长的判断正确，这些人早就应该转坐公车了（因为停车费用太贵）。所以，开私家车进城的人并不会因为费用问题而转坐公车。所以市长的判断是错误的，是市长原因的FLAW。

第二个问题偶对逻辑基本原理不熟，但个人理解在这个例子中FLAW等同于WEAKEN。

crystal2003

谢谢lukrenee。

但我还是有疑问，原题的提问是说：下面哪个陈述提供了证据说明市长所说的话中原因有缺陷？

我觉得B是推出市长的结论有误。

如果把这个题目当成weaken题来问的话，比如：下面哪个陈述weaken了市长的结论？这样，答案才应该是B。

不知道，都被搞晕了。

lukrenee

放一放，过几天或者第二轮的时候再来看，说不定一下就通了。

crystal2003

终于搞明白了， reasoning不是指原因，而是论据的意思。

所以，B提供了另一个论据，weaken了mayor的论据。

还是要谢谢你哦！