单项选择题

According to the passage, hearing loss is

A．only a minor health problem.
B．the world's most common health problem.
C．merely a teenage disease.
D．an incurable disease.
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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.
单项选择题
Since 1992, cancer death rates among black Americans
A．have been going up and down.
B．have remained stable.
C．have increased,
D．have fallen.
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