这题没人问，GWD8-21

GWD-8-Q21:GWD-2-18

Last year all refuse collected by Shelbyville city services was incinerated.  This incineration generated a large quantity of residue ash.  In order to reduce the amount of residue ash Shelbyville generates this year to half of last year’s total, the city has revamped its collection program.  This year city services will separate for recycling enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year’s number. 

Which of the following is required for the revamped collection program to achieve its aim?

A.      This year, no materials that city services could separate for recycling will be incinerated.

B.      Separating recyclable materials from materials to be incinerated will cost Shelbyville less than half what it cost last year to dispose of the residue ash.

C.      Refuse collected by city services will contain a larger proportion of recyclable materials this year than it did last year.

D.     The refuse incinerated this year will generate no more residue ash per truckload incinerated than did the refuse incinerated last year.

E.      The total quantity of refuse collected by Shelbyville city services this year will be no greater than that collected last year.

为什么不是E？请高手们帮忙，谢谢！

我选d

situation:去年，s城市将垃圾焚烧导致大量余灰，今年，为了使余灰减少到去年的一半，s城市决定将可循环回收的垃圾分离开足够多来以减少需焚烧的垃圾数量以便达到目标

reasoning:什么是s城市能够达到目标所必需的条件？s城市为减少一半余灰采取的手段是减少需要焚烧的垃圾，减少到什么数量呢？这个数量是根据去年的情况作的判断，总之s能分离出足够多的可循环回收垃圾（不需要进行焚烧的）。如果今年相同数量的垃圾进行焚烧后产生的余灰比去年多的话，那么s城市即便只焚烧去年垃圾数量的一半也无法达到目标。

答案：a,s分离出可以回收的垃圾不会被焚烧 （这个已经是题目里面的信息，不足以使s达到目标）

b,费用 - 不相关

c,可回收垃圾的比例比去年高 - 这个也不相关，因为s总能分离出足够多的可回收垃圾

d.相同数量的垃圾焚烧所产生的灰烬不会比去年多（这个是使计划能够完成的条件）

e.今年的垃圾总量不会比去年多（理由同c)

嗯，有道理，谢谢楼上！！！