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
The new bridge will be the way which ________ the towns on the opposite banks of the river.
A．communicates
B．attaches
C．connects
D．combines
单项选择题
Smart is in rather poor health and is ________ colds.
A．responsive to
B．responsible for
C．subject to
D．exposed to
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