单项选择题

All the following factors may increase cancer rates EXCEPT

A．occupational carcinogens.
B．lack of access to tobacco.
C．unhealthy habits.
D．aging populations.
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单项选择题
The report says that steps could be taken to reduce about
A．50% of new cancers.
B．33% of new cancers.
C．12%of new cancers.
D．80% of new cancers.
单项选择题
According to Paul Kleihues, cancer was once regarded as
A．an incurable disease.
B．a mysterious disease.
C．a "Western" disease.
D．a world disease.
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