单项选择题





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单项选择题
B
单项选择题
In the period from 1979-1989, on average, how much longer, in years, could a 45-year old Black man with a family income in excess of $25,000 expect to live than a 45-year old Black man with a family income of less than $10,000
A．4
B．6
C．8
D．10
E． 12
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