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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单项选择题
Which of the following words is formed through derivation
A．Foolish.
B．Clockwise.
C．Babysit.
D．Earthward.
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
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