单项选择题

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
______ is a unit of expression which has universal intuitive recognition by native-speakers, whether it is expressed in spoken or written form.
A．Morpheme
B．Word
C．Root
D．Stem
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
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