大全-B-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.（C）

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

答案C， 谁能简单说说E 呢

文章的结论是：美国的人口普查是精确的。论据是：同时漏数部分富人和穷人

要在这两者之间架桥，答案C当然比答案E更好。

我做assumption的题目，一般是先架桥，不行再取非。

E是无关，根本就不是在讨论economic status。

主要是理解这句话：the basic statistical portrait of the nation painted by the census is accurate.结合上下文就是说：虽然普查有漏掉一些人，但是整个阶层大体上的比例还是准确的。然后在看选项，C就很明显了。

哪里有说到什么“比例”的啊

我也错了，选了 A .怎么想C也不通，可能是读题就没读出其中的意思。