单项选择题

In which of the following years did the poor people constitute the largest proportion of the American population

A．1973.
B．1987.
C．1969.
D．1983.
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单项选择题
How many people are there in the United States in 1987
A．259 million.
B．117 million.
C．175 million.
D．230 million.
单项选择题
It can be inferred that poverty _________.
A．is defined very concretely in every period
B．is difficult to define in specific terms
C．is defined in material terms
D．is defined according to the standard of each decade
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