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标题: GWD-6-21疑问 [打印本页]

作者: wjtwenzi 时间: 2013-11-19 17:12
标题: GWD-6-21疑问
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.

不懂为什么选D，同时不懂E错在哪儿，请各位帮一下忙~

作者: soulwangh 时间: 2013-11-20 19:28
This question need you to find the assumption of the author.
Watch out the prompt " is required for the program"

The author claims that a program could reduce the amount of the refuse ash this year to half of last year's.
In order to substantiate this recommendation, the speaker employes the line of reasoning that the plan could reduce the number of truckloads to half of last year's by recycling enough refuse.

There are several questionable assumptions in this argument. The most obvious one is half number of truckload sufficiently equals to half amount of ash.
In other words, if you negate this choice, the author's conclusion is unwarranted and groundless.

About E. E is a strengthen option but not an assumption.
If you negate E, the total amount of the refuse is more than or equals to that of last year.
It does not necessarily damage the conclusion. It is quite possible that the recycling program is so efficient
that even the total amount of trash is more than last year, the amount of non-recycling refuse is less than last year.

作者: wjtwenzi 时间: 2013-11-20 21:41

soulwangh 发表于 2013-11-20 19:28
This question need you to find the assumption of the author.
Watch out the prompt " is required for ...

感谢，我已经完全明白了！

作者: frankzheng43 时间: 2017-7-20 12:35
Mark一下！

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