Traverton's city council wants to minimize the city's average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton's yearly maintenance costs?
(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
(B) Whether any cities have switched from Incandescent lights in their traffic signals to Lighting elements other than LED arrays
(C) Whether the company from which Traverton Currently buys incandescent bulbs for traffic Signals also sells LED arrays
(D) Whether Traverton’s city council plans to increase The number of traffic sights in traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic Signals know how to convert the existing fixtures so as To accept LED arrays
题目分析：问的是一下哪个选选能决定换新的灯泡确实可以最小化维护成本，我们来看一下选项A说我们要看一下LED这种灯泡的使用寿命，如果你要换灯泡，这个灯泡的使用时间长短会不会影响你的维护成本，有点吧，留着。B说城市换了除了LED之外别的灯泡，我谈的就是换LED灯泡是否省钱的问题，如果不是谈这种灯泡，就跑题了，杀。C说卖老灯泡的公司也卖新灯泡，扯得就更远了，杀。D说这个城市要增加红绿灯，增加红绿灯会增加采购成本，但是不会对维护成本有什么影响，干掉。E说换新灯泡的工人知道如何调整设备来适应LED灯泡，这个也比较远。
