Crowding on Mooreville's subway frequently leads to delays, because it is difficult for passengers to exit from the trains. Over the next ten years, the Mooreville Transit Authority projects that subway ridership will increase by 20 percent. The 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?


The population of Mooreville is not expected to increase significantly in the next ten years.

The Transit Authority also plans a 5 percent increase in the number of bus trips on routes that connect to subways.

The Transit Authority projects that the number of Mooreville residents who commute to work by automobile will increase in the next ten years.

Most of the projected increase in ridership is expected to occur in off-peak hours when trains now are sparsely used.

The 5 percent increase in the number of train trips can be achieved without an equal increase in Transit Authority operational costs.

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情景：Mooreville的地铁由于乘客人数众多而比较堵塞。在未来的十年里，乘客人数还要增长20%。为了保证地铁不进一步堵塞，政府机构打算增开5%批次的列车。

答案预估：

直接寻找解释原文预测（为何增开5%批次的列车就够了）的选项即可。


选项分析：

A选项：未来十年内，Mooreville的人口数不会增加。人口数增加并不代表乘坐地铁的人数增加。

B选项：Mooreville打算在到地铁站的路途上增加5%的公共汽车。公共汽车的乘坐着不一定和地铁的乘坐者有交集。

C选项：在未来10年内，用汽车上班的Mooreville人将会显著增加。无论用汽车的人是否增加， 因为逻辑题中前提必然正确，所以必然会有20%的地铁乘客量增加。所以本选项不能解释“为何增开5%批次的列车就够了”。

D选项： Correct. 大部分要增加的客流量都被认为会在非高峰期增加。若是大部分的客流平均的增加，那么20%的增长量会让仅增加了5%批次的地铁更加拥堵。反之，若大部分的客流都在非高峰期增加，那么不用增加批次也可能保证客运。

E选项：增加5%的地铁次数不会给Mooreville带来同等增加的运营费。运营费和5%是否足够无关。

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Prep2008E1-CR
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