C．More than 75%.

　　D．Less than 20%.

　　答案　B　[细节推断题。根据文章第一段倒数第二句“... more than 75 percent of all wealth is owned by 20 percent of American adults.”可推知此题答案为B项。]

　　3．Why is economic inequality still great in the US in spite of the economic growth?

　　A．Because the proportion of income received by the rich and the poor remains almost the same as in 1917.

　　B．Because the economic growth has widened the gap of the family income between the rich and the poor.

　　C．Because income in the US is still concentrated in the hands of the richest 10% of American families.

　　D．Because some Americans made great fortunes during the Second World War.

　　答案　A　[细节推断题。根据文章第二段第三句“The most striking aspect of income distribution is that it has not changed significantly since the end of World War II.”可推知此题答案为A项。]

　　4．What can we learn from comparison of the two poverty lines in the last paragraph?

　　A．The poverty line of 1918 is more favorable to the poor than that of 1981.

　　B．The 1981 line didn't leave much to the poor.

　　C．There were more Americans who were officially poor by the 1981 line.

　　D．There were more Americans who were officially poor by the 1918 line.

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