[求助]GWD-2-18

Question 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. 

红色标出的句子什么意思?

红色标出的句子什么意思?

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.

Answer: D

thx a lot!

The amount of residue ash= the number of truckloads of refuse to be incinerated * residue ash per truckload

现在the number of truckloads of refuse to be incinerated减少一半，要满足The amount of residue ash也减少一半，就要保证residue ash per truckload不能增加
        

这题以前有人问过的，具体参考（GWD上每题都有人问过的，你可以先检索以前的问题，没有明白再发新贴，节约你的复习时间）：

http://forum.chasedream.com/dispbbs.asp?BoardID=24&replyID=507278&id=58265&skin=0