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标题: og11-92 请教 [打印本页]

作者: yalemba2007 时间: 2006-9-3 11:06
标题: og11-92 请教

597

92. In order to finance road repairs, the highway commission of a certain state is considering a 50 percent increase in the 10-cents-per-mile toll for vehicles using its toll highway. The highway commissioner claims that the toll increase will increase the annual revenue generated by the toll highway by at least 50 percent per year.

Which of the following is an assumption on which the highway commissioner's claim depends?

(A) The amount of money required annually for road repairs will not increase from its current level.

(B) The total number of trips made on the toll highway per year will not decrease from its current level.

(D) The number of drivers who consistently avoid the highway tolls by using secondary roads will not increase from its current level.

(E) The total distance traveled by vehicles on the toll highway per year will not decrease from its current level. Argument Construction

Situation A state highway commission considers a 50 percent increase in the 10-cents-a-mile toll
on its toll highway; this increase promises at least a 50 percent increase in the revenue generated by the toll highway.

A

B

C

D

E

Reasoning On what assumption does this argument depend?The toll is charged on a per-mile basis. A 50 percent increase in the toll will bring a 50 percent increase in revenue only if the total number of miles traveled on the toll highway per year does not decrease.

Correct answer is E.

C the average length of a trip made on the toll highway 如果没有减少的话, 那么总距离不是也没有减少吗? 尽管我选的E, 但是觉得C 和E也没有本质的区别啊, 是不是我的理解有偏差?

作者: zlily424 时间: 2006-9-10 07:29

The annual revenue generated depends on the total distance traveled in a year. Average length of the trips is constant does not mean that the total distance traveled does not change.For example:

3 trips * 100 (miles) average length =300(miles)total distance

10 trips * 100 (miles) average length = 1000 (miles) total distance

Therefore,E is the best answer.C is not right.

作者: gogokaka 时间: 2009-9-8 10:40

不明白选项D 选择这条高速的司机减少，不就意味着行驶这条高速的总路程减少了吗？
所以D说司机没有减少为什么不能作为assumption？

求助~

作者: noss 时间: 2009-9-9 11:51

我来解释吧，这个决定减少的是总运行长度＝总长度×次数；D中的司机少了，但其他的司机增加了运行次数，也可能不会减少的。

要抓最后核心的地方。

作者: gogokaka 时间: 2009-9-9 21:55
恩有道理~因为有两个变量...谢啦

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