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.
答案C
想請問這題的假設思路是什麼？為什麼要補這個假設呢？
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