死活都不明白OG12里的这道题

jerry827

42. Crowding on Mooreville’s subway frequently leads to
delays, because it is diffi cult for passengers to exit
from the trains. Subway ridership is projected to
increase by 20 percent over the next 10 years. The
Mooreville Transit Authority plans to increase the
number of daily train trips by only 5 percent over the
same period. Offi cials predict that this increase is
suffi cient 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 offi cials’ 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.

我选的B
答案选D 我感觉D的中的off peak hours 根本不想关啊

我的理解是 题干:M地铁挤是因为乘客多,疏散难。但是在未来十年内要增加20%的ridership ，并将且增加5%的车次，officials因此预言这些增加足够让乘客拥挤的现象不再增加

D中的off peaktime在题干中压根没体现啊....而B中提供多一点的bus不是可以缓解乘客疏散的问题吗？

求NN解答 。。。。。。。

lihanljz

其实B才是无关选项，要仔细读一读它的意思：在连接地铁之间的道路上增加了bus并不能缓解地铁的乘坐拥挤情况吧。

D说增加的人在off-peak hours,所以并不会影响此时高峰期的乘客数量。所以不用按20%的比例去增加车次。

isaxi

你需要仔细把逻辑题的解题思路研究一下。支持题不一定从题干中找。因为原文中没有给出为什么推出结果，所以支持只需要直接支持结论。前提是人增了20％，但是车只需要5％就够了。为什么？D说增加的人都是在非高峰时刻，那时候并不拥挤。不是可以很好得支持结论吗？
B看不出来和地铁有什么关系。乘坐地铁的人和乘坐Bus的人有关系吗？如果说有，也是基于想象，而不是逻辑。

rainbowbravo

题目要你support official的prediction，不是要你提出解决办法

official说什么好，你就在答案里找什么能支持

official说什么不好，你就在答案里找什么说那个不好就可以了——D选项

MAKEAPOINT

原文的前提:Subway ridership is projected to increase by 20 percent over the next 10 years.

问的是在subway ridership增加20%这个情况下,要如何做才能保证地铁延误的情况不增加.因为增加的乘客主要集中在off-peak hour时段,这个时段原本是有许多趟列车没有得到充分使用 (sparsely used),所以在人数增加20%的情况下,列车数只要增加5%就够了.

B选项解决的是如何使subway ridership减少的问题 , 也就是让大家去乘巴士.而这个是试图改变问题前提,而不是解决(在这个前提条件下的)问题本身.

hxxjay

D说增加的20%的人都是在非高峰时刻，那时候并不拥挤 ==》5%的新增车次能更有效地运用到拥挤的时刻，所以有用              B中要注意看到bus是that contact to subways的bus，即其增加只会使得更多人搭乘它去坐地铁，而造成铁路的更大负荷

yayaxiaoxinxin

LZ,我一开始和你一样怎么也弄不懂为什么是D.后来查了ridership,才发现原来是我对这个单词不理解所导致的. ridership是指乘客. prediction成立的原因是,增加的20%的乘客大多是来自那些非高峰时段的.
只有这个成立时，只增开5%就能解决交通拥挤问题是可能的。
换一个角度来想，假如20%的乘客都是来自高峰时段的，那么恐怕至少得加开20%的班次才能解决交通拥挤。不是吗？

376709346

yayaxiaoxinxin 发表于 2010-8-22 00:08
LZ,我一开始和你一样怎么也弄不懂为什么是D.后来查了ridership,才发现原来是我对这个单词不理解所导致的. r ...

同意！               

北冥鲲

hxxjay 发表于 2009-11-8 01:29
D说增加的20%的人都是在非高峰时刻，那时候并不拥挤 ==》5%的新增车次能更有效地运用到拥挤的时刻，所以有 ...

同意！               

Bensontuo

jerry827 发表于 2009-8-25 16:03
42. Crowding on Mooreville’s subway frequently leads todelays, because it is diffi cult for passeng ...

Spot the question type: Discrepancy + Support


Apparently, if 5% of the daily train increased, it must be true that no delay be happened due to the fact that it won't be difficult for passengers to exit from the train even within the same period that the ridership is projected to increase by 20% over next 10years

So, what we want to do is to find a necessary assumption be guaranteed sufficiently if 5% of the daily train increased, and by which to sufficiently guarantee that by 20% of the ridership increased, it wont be difficult for passengers to exit from the train.

A. Its not about whether they can achieve the plan or not.

B. it its actually a weaken option. If B correct, then it must be true that the original plan is not perfect.

C. it is actually the support of " premise " that crowding must inevitably happened.

D. Great answer

預測到的未來壅擠情況都會發生在尖峰時刻, 而尖峰時刻目前是沒有安排火車的。

其實這就是條件邏輯拆解而已

所以有安排火車, 未來crowding的情況可以解決的。