大全-5-19

ping0114

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.

不明白为什么选A

晕........

juliaPL

这道题就是考绝对数字和相对的比率问题，绝对数字变化大，并不代表比率也变化大，那末只能是分母大了

ping0114

明白了

多谢.......

怎想不到呢........

三脚猫

julia  MM, can you explain more clearl? I  am still puzzled.

Maggiewjy

比率是参加low-price 的人数占总人数的比率。

分子是参加low-price 的人数。分母是参加low-price 和high-price 的总人数。如果参加high-price 的人数增加了，而比率不变的话只能是low-price的人数也增加了。这样整个分母就增加了。所以比率就不一定增加。。。这样解释应该还清楚把？？

晴天小狗

还是不明白  谁来讲讲...

digimagics

low pay  100 person , high pay 50 person ,  ratio  =0.5
add 20p to low pay , while 15p to highpay  , now ratio=65/120=0.54
though  5 more person added , the ratio is rised.