单项选择题

When is the conversation going on

A．Twenty days before Christmas Day.
B．Twenty-three days before Christmas Day.
C．A month before Christmas Day.
D．Two months before Christmas Day.
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单项选择题
Canada occupies about ______ of the North American continent.
A．1/3
B．1/2
C．1/4
D．1/5
单项选择题
Mark Twain's works are characterized by the following except ______.
A．sense of humor
B．egotism
C．jokes
D．tall tales
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