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请教OG12版 --7
7. 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 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 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
我想问这道题为啥不能选E。
我的思路：首先是一道评价题。然后评价的是结论，老师说的肯定和原因特别相关。那E不就是说得和原文的原因吗？（原文原因：Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal）不就是说转换成本吗？ |
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