单项选择题

The new theory was corroborated.

A．confirmed
B．bleached
C．hurled
D．refrained
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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
单项选择题
Cold air causes the arteries around the heart to constrict.
A．become rigid
B．contract
C．close
D．die
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