单项选择题


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单项选择题
C
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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