单项选择题

This new machine will ______ us from all the hard work.

A．dismiss
B．rescue
C．discharge
D．emancipate
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单项选择题
Over the centuries man has developed drugs that could cure or ______ illness and suffering.
A．accelerate
B．comfort
C．aggravate
D．alleviate
单项选择题
The engine was ______ by a tree lying across the line.
A．degraded
B．detached
C．dismissed
D．derailed
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