细节题,找准原文定位,不要按照自己已经有的知识想当然,是作者的意思不是你的意思。
A manufacturer's fixed costs and "sunk costs" (original capital investment in the physical plant) do not decrease when production declines due to inadequate supplies of raw materials, problems on the factory floor, or inefficient sales networks
total no for selecting 3 out of 10=10c3=120
no. of ways in which no two married people included= tot- 2 married couple included
2 married couple can be included in 5c1,no. of ways selecting a couple, * 8c1, no. of ways selecting the third person,=5 * 8=40
文章的开头+结尾+中间的过度转折部分都要仔细看!!
一定要边看边总结大纲在脑海中!!