单项选择题

_________ exerted by tornadoes that they have been known to lift railroad locomotives off their tracks.

A．The great force is
B．The force is great
C．How great the force is
D．So great is the force
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单项选择题
All the lights in the house are _________ in the draught from the opening window.
A．floating
B．fluttering
C．wavering
D．flickering
单项选择题
The negotiation had reached a (an) _________ , with both sides refusing to compromise.
A．impasse
B．deadline
C．impact
D．implement
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