单项选择题

We derive knowledge mainly from books.

A．deprive
B．obtain
C．descend
D．trace
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单项选择题
He decided to overcome his shortcomings.
A．convert
B．convict
C．conquer
D．convey
单项选择题
Soldiers have to obey orders.
A．reply to
B．apply for
C．abide with
D．comply with
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