A private bus company gained greater profits and provided bus service to the area at lower fares by running buses more frequently and stimulating greater ridership. Hoping to continue these financial trends, the company plans to replace all older buses with new, larger buses, including some double-decker buses,.
The plan of the bus company as described above assumes all of the following EXCEPT
(A) the demand for bus service in the company’s area of service will increase in the future
(B) increased efficiency and revenues will compensate for any new expenses the company incurs
(C) the new buses will be sufficiently reliable to ensure the company a net financial gain once they are in place
(D) driving the new buses will be no more difficult than driving the buses they are to replace（D）
(E) the larger, double-decker buses will not face obstacles such as height and weight restrictions in the bus company’s area of service
这道题目我觉得答案有问题。D和E其实意思都差不多。设想，如果新的bus开起来比原来的要困难，那么司机是否要额外的接受培训和训练，这也要增加成本，或者延误时间甚至增加事故率，从而抵消部分利润的啊。而E，很明显是同样类似的道理。虽然根据limited的原则，我选择了D，但是还是想不通这两个答案有什么区别。 | 
