求GWD6-32题目，感觉逻辑混乱，论坛关于这道题不多~~

jyw0411lsq

GWD6-Q33
GWD6-Q33:
CrowdingonMooreville’s subway frequently leads to delays, because it is difficult for passengers to exit from the trains.  Subway ridership is projected to increase by 20 percent over the next 10 years.  The Metroville Transit Authority plans to increase the number of daily train trips by only 5 percent over the same period.  Officials predict that this increase is sufficient to ensure that the incidence of delays due to crowding does not increase.
Which of the following, if true, provides the strongest grounds for the officials’ prediction?

A.    By changing maintenance schedules, the Transit Authority can achieve the 5 percent increase in train trips without purchasing any new subway cars.
B.    The Transit Authority also plans a 5 percent increase in the number of bus trips on routes that connect to subways.
C.    For most commuters who use the subway system, there is no practical alternative public transportation available.
D.    Most of the projected increase in ridership is expected to occur in off-peak hours when trains are now sparsely used.
E.    The 5 percent increase in the number of train trips can be achieved without an equal increase in Transit Authority operational costs.

求这道题完整的大意和，D的解释，我看到这道题有两个量，subway,  trains ,他们之间的关系怎么回事啊？
最后一句话的does not increase 是什么成分，是修饰crowding 的么，due to 是最后一句话的谓语吗？谢谢好心人的帮助！

hughlv

does not increase是修饰incidence of delays，due to crowding是修饰delays表原因。

sdcar2010

the incidence of delays (due to crowding) does not increase

sdcar2010

subway = train

hughlv

D.    Most of the projected increase in ridership is expected to occur in off-peak hours when trains are now sparsely used.
预计的乘客人数增长是发生在非高峰时段，由于现在火车已经很少作为交通工具。

文章的大意是：火车老是晚点，原因是乘客来不及下车。预计将来10年中还有20%的乘客人数增长。而有关部门认为在现有基础上增加个5%的班次应该能保证接下去至少晚点不会变得更严重。找支撑论据。

sdcar2010

when trains are now sparsely used = when trains are now sparsely used by the riders.

jyw0411lsq

这道题目说的train 和subway是一回事么，火车和地铁是两个东西啊~~~弱弱的问一下~

jyw0411lsq

谢谢哈，明白了！

jyw0411lsq

谢谢各位牛牛的解答，~~~

jyw0411lsq

GWD6-Q33
对于这道题的讨论还挺多的，但是只有mindfree大牛的以下说法让我有点明白：Here all we know is that crowding is to blame for delay. So 20%ridership, is occurs only during off-peak time, will not cause crowdingproportionately (20% to 20%). Therefore 5% increase in trips might wellmitigate the problem.

但是我认为还需要再理清一下这道题的思路。
Premise 1Crowding 导致delay，于是Subway ridership is projected to increase by 20 percent.
Premise 2 MT authority 打算增加20%班次，但车辆只增加5%。
conclusionOfficials predicts 这样做就可以解决由crowding导致的delay问题。

这里，需要补充的逻辑漏洞是什么？之前的讨论都绕在Premise1 和premise 2 是怎么对上号上。也就是为什么增加20%班次，5%车就能解决crowd导致的delay问题。但是看看选项怎么都对不上号，就连正确答案D也有点怪怪的：凭什么新加的20%是放在train 的off-peak time就能解决crowd问题？

其实，根据答案，我认为这题的逻辑漏洞在Premise 2这里：为什么加了20%班次，只要5%车就够用了？那回答就是选项D：因为有些班次是加在off-peak time的，所以不需要增加20%车，5%就够了，就能解决crowd问题。

总的来说这题设计的还是很莫名其妙的，至少在提问部分没让人看出想问的是这个逻辑加强问题。但是答案又是按这个思路来的。premise 1只是一个背景知识，不在逻辑链上。
[本帖最后由 afu1124 于 2010-01-21 21:20:17 编辑]

上面是引用一年前的解答，这里面怎么感觉出现问题了“，train trip,   ridership,  到底对应什么啊，？班次，车辆，乘客的人数？
上面的竟然说：增加20%班次，增加5%的 车辆数，  这个矛盾了吗？（ 见上面红笔）