单项选择题


A．average
B．medial
C．mean
D．extensive
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单项选择题
All the teachers ______ themselves to improve the quality of education.
A．give off
B．give out
C．give away
D．give for
单项选择题
A lot of people from big cities complain about the rapid ______ of modern life.
A．rate
B．speed
C．pace
D．step
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