大全-5-19。谢谢

hgconnie

大全-5-19.
                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.

低收入的人数增加了，但是总体收入群体中，却是高收入的比例增加了。说明高收入的人数增加的更多。

看了讨论贴还是不明白，应该是B啊，怎么是A呢。晕了。。。救命。

星耀苍穹

借助数学方法表示可能容易理解一点

低收入人群增加，所占的share没有增加，说明总样本基数增加了，总样本增加数/总样本基数>=低收入人群增加数/低收入人群基数；s/S>=l/L

总样本基数增加了，高收入人群所占share增加了，说明高收入人群增加数/高收入人群基数>总样本增加数/总样本基数； h/H>s/S

then，高收入人群增加数/高收入人群基数>总样本增加数/总样本基数>=低收入人群增加数/低收入人群基数; h/H > (s/S) >=) l/L

i.e. L/l> H/h

Meanwhile，低收入人群增加最厉害，l>h, 加上上一个条件 L/l > H/h

那么必然最初是 L>H 才有可能

星耀苍穹

B的话~从文中所给无法很直接的得出结论~因为working employee的数量与基数是有关的~就基本能判断是混淆项~

再根据之上对A项是正确项的推断，L>H,l>h， L+l>H+h,发现根本是个错误项。

其实GMAT有时候真的就是靠直觉，不会要你饶太多弯想太多~想到第一步的时候基本就确定了

hgconnie

谢谢解释。

明白一点了。

脑袋清醒的时候再看看。。。谢谢