大全-B-19

eSpirit

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.（C）

(E) The primary purpose of the census is to analyze the economic status of the American population.

答案C是如何推出的呢，实在不明白

bigp

I think the argument has a assumption as C mentioned: the affect (percentage, I belive census is mainly about the number of people)uncounted poor cause the census can offset that caused by uncounted rich(percentage). Hope it make sense.  

lexie

Sorry, upstairs...it still doesn't make any sense to me...I was wondering...how to connect the percentage and the accuracy of the statistical portrait of the nation together?