求教大全一题，为何是A不是E？

frankzhiwei · 发表于 2010-11-23 21:21:07

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~

frankzhiwei · 发表于 2010-11-25 10:46:46

继续求解释！

kevin0214 · 发表于 2010-11-25 11:49:14

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%

cc621josh · 发表于 2010-11-25 13:51:59

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！

kevin0214 · 发表于 2010-11-25 14:37:47

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……

legendo5y8t · 发表于 2010-11-25 15:21:20

……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？

legendo5y8t · 发表于 2010-11-25 19:30:56

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

donkid · 发表于 2010-11-26 14:55:53

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。

求教大全一题，为何是A不是E？

所属分类: GMAT考试

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