单项选择题

It is not as difficult to store information as it is to ______ it quickly when it is wanted again.

A．represent
B．retain
C．restore
D．retrieve
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单项选择题
His plan is not practical and is ______ to failure.
A．expected
B．doomed
C．due
D．predicted
单项选择题
The ______ has left for the Antarctic and it will come back in six months.
A．expedition
B．execution
C．exploration '
D．delegation
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