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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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．240 million.
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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