【求助】逻辑大全上的一道题

lisiberry

19. The U.S. census is not perfect: thousands of Americans probably go uncounted. However, the basic statistical portrait of the nation painted by the census is accurate. Certainly some of the poor go uncounted, particularly the homeless; but some of the rich go uncounted as well, because they are often abroad or traveling between one residence and another.

Which of the following is an assumption on which the argument above depends?

(A) Both the rich and the poor have personal and economic reasons to avoid being counted by the census.
(B) All Americans may reasonably be classified as either poor or rich.
(C) The percentage of poor Americans uncounted by the census is close to the percentage of rich Americans uncounted.
(D) The number of homeless Americans is approximately equal to the number of rich Americans.
(E) The primary purpose of the census is to analyze the economic status of the American population.

OA：C

条件是国民调查不完美，有穷人和富人没被算进去。
问那个假设是必要的
C 穷人和富人没算进去的比例是一样的。

没看明白这个逻辑？不一样也没什么关系吧。这道题我选E。
大全要是有解释就好了。

猫樱花

这道题应该不会有异议吧。。。

lisiberry

猫樱花 发表于 2017-2-19 18:54
这道题应该不会有异议吧。。。

没有太大异议，就是不太明白，大牛，可否讲解一下呢？

lisiberry

明白鸟