单项选择题

metal must be hammered and cooled rapidly to ________ internal stress caused by heating.

A．retain
B．release
C．relieve
D．replace
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单项选择题
At the meeting both sides exchanged their views on a wide ________ of topics they were interested in.
A．extent
B．number
C．collection
D．range
单项选择题
Eather wanted to go to Philadelphia by herself, but her parents-would not give their ________.
A．contest
B．consent
C．convenience
D．control
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