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单项选择题

Which may NOT be a reason for higher cancer death rates among US blacks

A．Unequal access to medical care.
B．Greater probability of having other diseases.
C．Differences in the biology of the cancer.
D．Early diagnosis.
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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.