单项选择题

College students in this city have set up "the Cleaner Air Society" to help urban citizens become aware of the _________ to our environment.

A．conditions
B．situations
C．dangers
D．threats
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单项选择题
The director tried to wave aside these issues as _________ details that would be settled later.
A．preliminary
B．primary
C．trivial
D．alternative
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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