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.

答案给的是D，但我觉得画线句子好像说的是将可回收的垃圾分类，并没有提到烟的问题。

请理解的G友指点一二，谢谢。

这个题目类似not+weaken的assumption题目。

所以对D取非，看是否能削弱结论。D说每车垃圾产生的灰不会比上年多，取非之后就是每车垃圾比去年的灰还要多，那么原文的结论自然不能成立。所以D支持了结论。