单项选择题

Wild ducks always fly in a definite ______ .

A．figure
B．formula
C．shape
D．formation
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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
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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