求问一道逻辑题

brucelee8856 · 发表于 2010-9-6 22:14:18

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
(E) The rate of growth for low-paying service occupations will be greater than the overall rate of employment growth between 1982 and 1995.
答案为A，我只用数字代入证明了，还有什么办法啊，求解

brucelee8856 · 发表于 2010-9-7 12:09:14

求解啊求解

mudiduange · 发表于 2010-9-7 15:53:22

原文说了三个信息：
1、1982-1995，最快的就业人数增长出现在low-paying service
2、low-paying service 在总的就业人数中的比例不会增长
3、high-paying service occupations 比例会增长

A：
采用反面论证会好点。如果低工资的人数少于高工资的，那么当低工资的人数增长的最多的时候（比高工作的增长的多），则低工资的在总数中的占比肯定会提高。而原文给的是不提高，因此低工资的不会比高工资的少。

用正面论证也可以。
因为低工资增长了最多，但其占比没有增长，只能说明低工资原本就比高工资的人数多。因为人数多，增长的多，增长的相对比例可以是一样的甚至还要小于那个低增长的，因此其增长后在总人数中的占比不会增长。

这题有点绕：）

求问一道逻辑题

所属分类: GMAT考试

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