求助两道逻辑题, 我不知道该怎么想:(

1
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.
A. In 1982 more people were working in low-paying service occupations than were working in high-paying service occupations.
. 答案选A
请问大家,这道题里有没有用到数学的思想呢? 为什么low-paying就业人数增加的最多,但是占整个就业人数的比例不变, 而high-paying的就业人数占整个的比例增加,就能得出A的结论?

2. For a local government to outlaw all strikes by its workers is a costly mistake, because all its labor disputes must then be settled by binding arbitration, without any negotiated public-sector labor settlements guilding the arbitrators. Strikes should be outlawed only for categories of public-sector workers for whose services no acceptable substitute exists.

B. where strikes by all categories of public-sector workers are outlawed, no acceptable substitutes for the services provided by any of those workers are available.
C. Binding arbitration tends to be more advantageous for public-service workers where it is the only available means of settling labor disputes with such workers.
答案选C, 可是我觉得B没错呀, 题里不是说在没有别的替代的情况下, 可以禁止罢工, 那要是某地区所有部门都被禁止罢工,不是说明他们没有别的替代方法吗?我有点糊涂,谢谢XDJM帮我解释一下[em08]