在看逻辑分析的时候觉得其实OG上的逻辑有漏洞，比如OG１１Reviewer３９题:
39. A certain mayor has proposed a fee of five dollars 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 l 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 already 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-dollar-per-day fee．
(E) During the average workday, private vehicles owned and operated by people living within the city account for 20 percent of the city's traffic congestion．
Evaluation of a Plan
Situation In order to alleviate traffic congestion，the mayor proposes a five dollar daily fee on private vehicles entering the city．Because the fee is more than the round-trip bus fare，the mayor believes many drivers will switch to buses．
Reasoning What flaw exists in the mayor’s reasoning? The mayor apparently believes that saving money is the decisive issue for drivers．If, however, drivers are already paying more in parking fees than they would in fares as bus commuters，then saving money is not the reason they are choosing to drive their cars rather than take the bus．These drivers will not change their behavior simply to save money．
A The increased cost of fuel does not point to a weakness of the mayor's plan；it could possibly be a reason that citizens would endorse it．
B
Correct．This statement properly identifies a flaw in the mayor's reasoning．分析中指出省钱是市长认为人们改坐公交的原因．由于原来的停车费已经高过５刀，人们还愿意开私车进城，所以省钱不是决定性因素．（漏洞：这并不代表人们就不在乎钱！假设停车费是６刀，人们的平均承受力是７刀，那么人们自然仍然愿意开私车进城，若再加５刀进城费，那么总费用高出承受力，人们则会选择公交．所以停车费高于５刀说明不了钱不是决定性因素！）
C Current bus riders are not relevant to the mayor's plan，which anticipates only the newly added bus riders coming from among the current drivers．
D Many drivers may continue to commute in their private vehicles，but others might switch to buses．The mayor's plan does not anticipate a switch by all drivers 奇怪了，这个答案为什么就不对呢？
E The 20 percent figure shows that most congestion is caused by vehicles entering from outside the city；this does not point out a weakness in the mayor's plan．
The correct answer is B．
为什么啊？！还有一些别的例子也是同样的情况，难道是我的思路和老外的思路实在难以相交？？
决定性因素
不在乎钱
这两者不一样啊。
Please pay attention to the words "considerably more expensive"
I think it indicates an amount bigger than 7 dollars.
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