GMAT申友逻辑CR题库-Traverton's city council wants to minimize the city's average yearly expenditures on its traffic signal lights and so is considering-OG16-真题答案解析

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CR544-556题

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

(D) Whether Traverton's city council plans to increase the number of traffic signal lights 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

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题干：T市�

�会想节约每年在交通信号灯上的开支，所以他们考虑将目前使用的白炽灯在坏掉之后换成LED。与白炽灯相比，LED消耗更小的能量而且成本不会比白炽灯更高。另外，周边的配套设施转换成本是非常低的。题目：确定下面哪一条对于我们评估这个计划的目的是否能达到是至关重要的。分析：补充前提条件型正向逻辑，同时从题干内容上看也是PLAN类型题目，那么我们关注的重点就要放在PLAN的目的----节约开支上。已有的条件包括了采购成本和能源消耗，那么没有考虑到的因素主要就剩下了维护保养费用和使用寿命。 A选项，LED的预期使用寿命是否至少和白炽灯相同。符合我们的预判，在使用寿命上获得更多信息。 B选项，别的城市是否更换了LED跟T市是否更换且是否能达成T市议会的目的没有必然联系，错误类比。 C选项，目前T市购买白炽灯的公司是否也生产LED，完全无关的属性，错误！ D选项，市议会是否增加交通信号灯的数量，增加信号灯数量也是从LED和白炽灯二选一，还是要从灯泡材质本身角度去分析总的消耗。 E，市政工人们是否知道如何更换配套设施，无关属性，排除！