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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单项选择题
The graduate students will convene in the Student Union.
A．converse
B．meet
C．summon
D．raze
单项选择题
Some birds consistently return to the same nesting area each spring.
A．occasionally
B．purposely
C．regularly
D．surprisingly
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