单项选择题

Black Americans are more likely to die of cancer than

A．people in other countries.
B．white Americans.
C．all other Americans.
D．their ancestors.
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单项选择题
Public policy and education efforts may help to do away with
A．death rates.
B．various cancers.
C．unfair social differences.
D．biological differences.
单项选择题
Power supply system was not damaged during the storm.
A． Right
B． Wrong
C． Not mentioned
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