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
When a person's brain is dead, he _____.
A．will never wake up again
B．maybe wakes up again
C．will wake up again by using a machine
D．sometimes wakes up
单项选择题
A．zonesB．placeC．positionD．district
A．zones
B．place
C．position
D．district
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