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．threshold
B．edge
C．porch
D．course
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单项选择题
They were _______ in their scientific research, not knowing what happened just outside their lab.
A．submerged
B．immersed
C．dipped
D．drowned
单项选择题
There is supposed to be a safety _______ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
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