单项选择题

They are studying whether the project of landing a manned disc on the Mars is ___________.

A．probable
B．feasible
C．reliable
D．available
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单项选择题
The new father ___________ with pleasure when he saw the baby for the first time.
A．glowed
B．beamed
C．shined
D．flashed
单项选择题
It is the responsibility of the police to ___________ law and order in the city.
A．retain
B．restrain
C．remain
D．maintain
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