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
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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
单项选择题
The factory has turned out______.
A．twice TV sets this year more than last year
B．TV sets this year twice as many as last year
C．twice as many TV sets this year as last year
D．TV sets twice more this year than last year
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