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求教大全一题,为何是A不是E?

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楼主
发表于 2010-11-23 21:21:07 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
Recent estimates predict that between 1982 and 1995 the greatest increase in the number of people employed will be in the category of low-paying service occupations. This category, however, will not increase its share of total employment, whereas the category of high-paying service occupations will increase its share.


If the estimates above are accurate, which of the following conclusions can be drawn?


(A) In 1982 more people were working in low-paying service occupations than were working in high-paying service occupations.

(B) In 1995 more people will be working in high-paying service occupations than will be working in low-paying service occupations.
(C) Nonservice occupations will account for the same share of total employment in 1995 as in 1982.
(D) Many of the people who were working in low-paying service occupations in 1982 will be working in high-paying service occupations by 1995.A
(E) The rate of growth for low-paying service occupations will be greater than the overall rate of employment growth between 1982 and 1995.

小弟选了E,求解释~
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沙发
 楼主| 发表于 2010-11-25 10:46:46 | 只看该作者
继续求解释!
板凳
发表于 2010-11-25 11:49:14 | 只看该作者
假设原本有100万就业人口,90万低收入,10万高收入;现在就业人口增加到200万,新增的100万中80万是低收入,20万高收入,高收入阶层就从10%变成了15%,低收入从90%变成了85%
地板
发表于 2010-11-25 13:51:59 | 只看该作者
楼上不对!

假设原本100万就业人口,20万低收入,80万高收入;现在就业人口增加到110万,新增的10万中9万是低收入,1万是高收入,高收入阶层就从80%变成了73.6%,低收入阶层从20%变成26.4%,A不满足了!关键要看阶级增长与总增长的相对关系!

我也认为E是对的,纯代数式能推出来,答案应该是错了!
5#
发表于 2010-11-25 14:37:47 | 只看该作者
楼上……你假设了一个跟A完全相反的情况,然后推出A不满足……
如同:我假设1+1不等于2,然后推出1+1确实不等于2……
6#
发表于 2010-11-25 15:21:20 | 只看该作者
……in the category of low-paying service occupations. This category, however, will not increase its share of total employment……这指,low-paying occupations在82年与95年间“占比”不变啊各位,只有A对,E中的overall rate何来只有?
7#
发表于 2010-11-25 19:30:56 | 只看该作者
修正,是“占比”不升,可能不变甚至降低,二楼的解释是个好例子
8#
发表于 2010-11-26 14:55:53 | 只看该作者
比例这个不好说的嘛!主要是GMAC喜欢中庸的选项,怎么都说得通,如果是E的话换个数据就有推翻的可能。个人意见。
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