标题: 【求助】逻辑大全上的一道题 [打印本页] 作者: lisiberry 时间: 2017-2-19 15:28 标题: 【求助】逻辑大全上的一道题 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。
