单项选择题

The traditional dividing line in America between "east" and "west" is ______.

A．the Mississippi river
B．the Appalachians
C．the Rocky Mountains
D．the Hudson fiver
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单项选择题
Syntax mainly deals with ______.
A．how a language changes through time
B．how words are combined to form sentences and the rules
C．how the human work when they use language
D．how a language varies through geographical space
单项选择题
Maples are always used to symbolize ______.
A．Australia
B．America
C．England
D．Canada
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