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
Great efforts to increase wheat production must be made if bread shortages ________ avoided.
A．will be
B．can be
C．are to be
D．were to be
单项选择题
In order to be a good scientist, ________.
A．mathematics is urgent
B．one should have the mathematics
C．one must understand mathematics
D．mathematics is important to be understood
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