单项选择题

Poor health and lack of money may both be ______to educational progress.

A．restraints
B．stains
C．scarcities
D．barriers
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单项选择题
He was at the______ of his career when he was killed in a traffic accident.
A．glamour
B．extreme
C．bloom
D．peak
单项选择题
We Americans do a lot of business______ lunch, but people here prefer to tell stories.
A．in
B．over
C．within
D．without
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