单项选择题

As a developing country, we must keep ________ with the rapid development of the world economy.

A．speed
B．pace
C．move
D．step
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单项选择题
A good teacher must know how to ________ his ideas to the students, as generally agreed by educational experts.
A．display
B．convey
C．transmit
D．illuminate
单项选择题
The scientists have absolute freedom as to what research they think it best to ________.
A．engage
B．chase
C．seek
D．pursue
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