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 lecturer made such a boring speech. But I wasn't bothered by the dullness ______ by his carelessness.
A．more than
B．so much as
C．than
D．as
单项选择题
The earnings of women are well below that of men ______ educational differences that are diminish-ing between the two sexes.
A．although
B．though
C．despite of
D．in spite of
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