单项选择题

Modem appliances ________ us from a good deal of household work. For instance, the dryer frees us from hanging the laundry.

A．escape
B．benefit
C．liberate
D．comfort
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单项选择题
While in bed the doctor was telephoned to go back to the hospital because of ________ case.
A．a treatment
B．an operation
C．an incident
D．an emergency
单项选择题
The newly -built principal museum seems ________ enough to last a hundred years.
A．steady
B．substantial
C．sophisticated
D．spacious
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