单项选择题

Air is the mixture of gases in which ______ the gas is oxyen.

A．not every of
B．not all
C．none of
D．all of
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单项选择题
Many elderly people have to live on the money they ______ when they were working.
A．laid up
B．put back
C．set up
D．put aside
单项选择题
It was necessary to ______ the movie Roots” into five parts in order to show it on television.
A．adapt
B．abridge
C．segment
D．transact
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