大全-5-19

笨笨可可

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.

求助一下这题的推导是怎么出来的？

share是说某个人群的人数/总就业人数吗？

ivyqxx

以下是引用笨笨可可在2008-6-11 14:25:00的发言：

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.

求助一下这题的推导是怎么出来的？

share是说某个人群的人数/总就业人数吗？

lz对share的理解是对的

说更多的人1995会在low-paying里面，但是比例不变，而一小部分人1995会在high-paying，而占总体的比例却会提高，说明原来在low-paying的人很多，比如说有总共有1000个人，900个low-paying，多12个人对总体所占的比例几乎没影响；但是如果high-paying总共只有100个人，多8个人对其总体比例就有比较大的影响。

（具体不算了，lz体会下）

笨笨可可

谢谢lz，但是总共人数1995年和1982年也是不同的啊？