单项选择题

As one of the youngest professors in the university, Miss King is certainly on the _________ of a brilliant career.

A．end
B．edge
C．threshold
D．course
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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
单项选择题
You must _________ yourself or they will continue to bully you, so you will go on living in disgrace.
A．assess
B．assert
C．maintain
D．promote
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