单项选择题

This line was carrying equal number of eastbound and westbound trains, and they ______ regularly.

A．altered
B．alternated
C．switched
D．exchanged
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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．transmit
B．transfer
C．convey
D．communicate
单项选择题
The news of our team winning the match was really ______, and millions of people came out to celebrate the victory.
A．overwhelming
B．accelerating
C．prompting
D．preceding
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