单项选择题

We must take part in physical labor in order to ______ ourselves more closely with the working people.

A．identify
B．incorporate
C．combine
D．involve
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单项选择题
For all the latest pop music, tune ______ your favorite radio station.
A．on at
B．in to
C．up with
D．along for
单项选择题
Many elderly people are now not used to the ______ of modem living, which they consider is away from the old customs.
A．tendency
B．tend
C．trend
D．treat
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