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閱讀理解：
The United States perceives itself to be a middle-class nation.However,middle class is not a real designation,nor does it carry privileges.It is more of a perception,which probably was as true as it ever could be right after World War II.The economy was growing,more and more people owned their own homes,workers had solid contracts with the companies that employed them,and nearly everyone who wanted a higher education could have one.
The information in this passage deals with_______.
A.an individual
B.a social and economic group
C.a political organization
D.Government
正確答案：B
答案解析：答案選B.通過(guò)閱讀本段，middle class中產(chǎn)階級(jí)是一個(gè)群體，選答案B.
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