单项选择题

A pair of night birds circled above, the ______ of their wings and their weird screams penetrating the thickening mist.

A．slapping
B．clapping
C．flapping
D．flipping
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单项选择题
A resolution to maintain the ceasefire was carried by an ______ majority.
A．overwhelming
B．overthrowing
C．overflowing
D．overturning
单项选择题
Recent changes in climate may ______ that global warming is starting to have an effect.
A．exemplify
B．witness
C．signify
D．swear
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