单项选择题

Researchers have studied the connection between aspirin and heart disease for _______.

A．more than a century
B．more than ten years
C．more than one year
D．a few years
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单项选择题
From this passage, we learn that aspirin is usually used to treat _______.
A．heart attacks
B．older men
C．older women
D．other disease
单项选择题
Researchers in the United States carried out the study with the help of _______.
A．young people
B．some old people
C．men doctors
D．woman doctors
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