OG12 07 一个长难句读不懂。 求教！

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Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffi c 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 signifi cantly less energy

and cost no more to purchase. Moreover, the costs associated with the conversion of existing fi xtures 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
l
ikely 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 traffi c signals to lighting elements other
than LED arrays

(C) Whether the company from which Traverton currently buys incandescent bulbs for traffi c signals also sells
LED arrays

(D) Whether Traverton’s city council plans to increase the number of traffi c signal lights in Traverton

(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffi c signals know how to
convert the existing fi xtures so as to accept LED arrays

正选是A
但是A看不懂。。。我理解的是：是否期待的生活 of LED 是至少的 只要现在使用incandescent bulbs （好像不对）
或者at least as long as是在一块的？

麻烦各位分析一下句子结构,我想把这个难句分析清楚  先谢谢各位了！

cooldavy

A、LED的工作寿命是否不少于与当前所使用的灯泡
题干只讲到单位成本一样，但是没讲时间是否一样，如果led灯泡需要1天1换，那么成本反而就比现在使用的灯泡高了

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明白了！！！多谢！