单项选择题

As one of the youngest professors in the university, Longfellow is certainly on the ______ of a brilliant career.

A．porch
B．edge
C．threshold
D．fringe
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单项选择题
The experts ______ on the cause of poverty but agree on steps to eradicate it.
A．differ
B．distinguish
C．dissent
D．object
单项选择题
She is the ______ holder of the 3,000-meter world record, but there is no guarantee that she will win in the Olympic Games.
A．current
B．predominant
C．prevailing
D．prevalent
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