求助OG12-107之前沒有討論過

tintinc

5l的解释很强大。。。D理解了。。。

可是A为神马不对类？

tintinc

说白了，这道题就是单量*数量=总量
residual ash/per truckloak  *  number of truckloads=total of residual ash

-- by 会员 efay (2010/1/30 9:12:03)

我是想说，E选项是建立在separated了的refuse for recyling不会被incinerated的基础上，如果被recyled的refuse也会incinerated呢？做这道题的时候，觉得A和E是从两个出发点考虑的。。。

sdcar2010

A is simply too restrictive to be an assumption for this question. Once the city reaches its goal of 50% less burning, it can burn all the trash it wants.

tintinc

sdcar大侠好OG... 再举手：A是错在too restrictive，而题目的问题是which is required不是which is the most supportive上吗？

sdcar2010

Required in this case = must-be-true; not might be true.

tintinc

谢谢大侠~一旁消化去了

xibao

不懂E....谁解释一下啊555555555555555555

davidliuscu

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

我的理解：
1.Required in this case = must-be-true
2.E项是非必要条件（因为E的否命题不能一定导致Program失败）

davidpan86

还是不明白，题目中第一句Last year all refuse collected by Shelbyville city services was incinerated.指的应该是去年回收的垃圾都被焚烧了吧。楼上有人说文章说的目的是要把烧垃圾的 residual ash减少一半，但文中只说In order to reduce the amount of residual ash Shelbyville generates this year to half of last year's total，我的理解应该是目标今年产生的废气是去年的一半，那么如果去年的垃圾都烧了，今年的一部分回收利用了，一部分烧了，产生的废气不就少了吗？
所以我选了C，求指导

sdcar2010

还是不明白，题目中第一句Last year all refuse collected by Shelbyville city services was incinerated.指的应该是去年回收的垃圾都被焚烧了吧。楼上有人说文章说的目的是要把烧垃圾的 residual ash减少一半，但文中只说In order to reduce the amount of residual ash Shelbyville generates this year to half of last year's total，我的理解应该是目标今年产生的废气是去年的一半，那么如果去年的垃圾都烧了，今年的一部分回收利用了，一部分烧了，产生的废气不就少了吗？
所以我选了C，求指导

-- by 会员 davidpan86 (2011/7/9 0:25:25)

C) is not required because it is possible that there were already more than 50% recyclable materials in trash last year. If that was the case, as long as the recyclable portion this year is as large as that in last year, the goal of the city is achievable. Thus, C) is not a necessary assumption.

If C) changes to "Refuse collected by city services will contain at least 50% recyclable materials this year,", then C) would be a necessary assumption.