求助OG12-107之前沒有討論過

a9141067s

107. Last year all refuse collected by Shelbyville city services was incinerated. This incineration generated a large
quantity of residual ash. In order to reduce the amount of residual 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 residual 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 residual 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.

答案是(D)

請問哪位NN幫忙說說(A)為啥不對

krystal6

这题我开始也confused。
我觉得可以当成所有垃圾都是一种垃圾，无论你焚烧多少垃圾，焚烧垃圾的量/焚烧产生的灰尘这个ratio都是不变的。也就是说垃圾量减半，灰尘量也应该减半。
D排除的可能性是今年一车垃圾焚烧产生的气体不会比去年多，也就是前面说的那个ratio不变

lycorisss

我觉得A是irrelevant  不过og上对A的解释看不明白
This merely indicates that no further reduction of ash through recyclingcould be achieved this year; it indicates nothing about how much the ash willbe reduced."
各位CDers 能不能解释下？

lilian0807

C 说的是比例，和总量无关的
如果今年的refuse总量很小，即使recyclable的比重很大，量可能还是小于去年

小迪大战GMAT

看了上面NN的解释，还是没搞懂C为什么错了？
OG的解释是：no info is provided about how much recyclable materials were removed from thhe refuse last year.
这是什么意思啊？？
那位大侠详细解释一下！谢谢！

undefeatedxk

其实A可以这样理解，plan里面也没说要烧recycle的东西啊，这个是硬加上去的，所以不在讨论范围内。

davidpan86

It seems that you did not understand the stimulus at all. In the stimulus, it says that "to reduce the number of truckloads of refuse to be incinerated to half of last year's number." And there is no "有害气体" involved here. We only care about ASHES.  Read the stimulus again and find out what are the premises and conclusion . . .

-- by 会员 sdcar2010 (2011/7/10 7:49:29)

[/quote]Thanks，I didn't understand the last sentence before.

sdcar2010

即使每车比以前产生的有害气体少了，如果垃圾总量比以前多，还是无法降到50%

The show me why D is not necessary.

-- by 会员 sdcar2010 (2011/7/9 19:59:15)

-- by 会员 davidpan86 (2011/7/9 23:25:47)

It seems that you did not understand the stimulus at all. In the stimulus, it says that "to reduce the number of truckloads of refuse to be incinerated to half of last year's number." And there is no "有害气体" involved here. We only care about ASHES.  Read the stimulus again and find out what are the premises and conclusion . . .

davidpan86

即使每车比以前产生的有害气体少了，如果垃圾总量比以前多，还是无法降到50%

The show me why D is not necessary.

-- by 会员 sdcar2010 (2011/7/9 19:59:15)

sdcar2010

Then show me why D is not necessary.