单项选择题

After investigation it was proved that the ______ letter was written by a teacher.

A．anonymous
B．simultaneous
C．spontaneous
D．homogeneous
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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
单项选择题
His plan is not practical and is ______ to failure.
A．expected
B．doomed
C．due
D．predicted
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