单项选择题

There are two main requirements before the fifth-generation computer can become a reality and it is these that scientists are _________.

A．anticipating
B．tackling
C．manipulating
D．speculating
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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
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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