单项选择题

It is bad manners to ______ other people behind their backs.

A．do up
B．do by
C．do away with
D．do down
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单项选择题
While nuclear weapons present grave ______ dangers, the predominant crisis of overpopulation is with us today.
A．inevitable
B．constant
C．overwhelming
D．potential
单项选择题
Thank you for applying for a position with our firm. We do not have any openings at this moment, but we shall keep your application on ______ for two months.
A．pile
B．segment
C．sequence
D．file
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