OG12 CR 42 不是很理解，请教！

vansonkate

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 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 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.


答案是D，不知道为什么？ 请教大家。

lxw19

大意是说由于未来十年将会有有更多的人乘坐Subway，增幅为20%，面对这一事实，authority做出了反应，但只增加了5%，但从百分比比来看，有些不合理啊~~但官方人员却说5%足以，原因就是D --Most of the projected increase in ridership is expected to occur in off-peak hours when trains are now sparsely used，也就是说增加的那些ridership是在非高峰期，这样的话，最紧张的高峰期的ridership不会有太大的变化，5%足以解决~~

07170004hjq

因为 5% 的车全部集中在 上下班高峰 所以问题就解决了

小唯唯

因为 5% 的车全部集中在 上下班高峰 所以问题就解决了

-- by 会员 07170004hjq (2010/6/2 18:04:46)

啊？？说反了吧？？？是低峰吧

米样

我个人觉得新增加的5%的车次，应该是在高峰期的，才符合常理。其实，车次增加在哪个时间段并不是最重要的，最重要的是，车次增加了。要以增加5%的车次解决掉增加了20%的客流量的拥挤问题，只能通过疏散客流量的密度来解决，也就是选项D所说的，交通部门预计增加的客流量在非高峰阶段，所以对于增加5%的车次很有信心。

一眼万年

刚开始这题我也没看懂，仔细看D其实是说他们能够预测到增加出来的这20%客流量基本都是集中在非高峰期的，所以预测增加5%的列车就够了。
总觉得不太符合常理，我刚看觉得B还挺有道理的，想想觉得不靠边。

vilawe

哦~现在懂了