单项选择题

A person who deals with the public must be courteous at all times, even when he or she is very tired.

A．forthright
B．polite
C．decisive
D．neat
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单项选择题
Cold air causes the arteries around the heart to constrict.
A．become rigid
B．contract
C．close
D．die
单项选择题
The graduate students will convene in the Student Union.
A．converse
B．meet
C．summon
D．raze
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