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
By a well-oiled cog in the machinery the author intends to render the idea that man is _________.
A．a necessary part of the society though each individual's function is negligible
B．working in complete harmony with the rest of the society
C．an unimportant part in comparison with the rest of the’society, though functioning smoothly
D．a humble component of the society, especially when working smoothly
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
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