GWD6-Q33

ardor

GWD6-Q33:
Crowding on Mooreville’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.


按照我从XDF老师那学到的，加强题"support"在考察一个argument时，正确选项是“与原因互补，让结论更好达到”，于是我考虑了A和B，最后选了A。结果正确答案却是D。我真的cofused了。

还有这种加强题应该怎么验证答案啊？

edalee

第一个选项无关吧，D的意思是，那些预计多出来的乘客是在非高峰期乘坐地铁，所以加5%就够了，貌似

bonfin

原文说预计有20%的乘客数量增长，但是只用增加5%的daily trips就够了。
注意D选项说的是most，即增加的大多数都是在非高峰期，所以5%足以解决问题，拥挤造成的延迟不会增多。