单项选择题

The longest river in Canada is ______.

A．the Seven
B．the Yukon
C．the Mackenzie
D．the St. Lawrence
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单项选择题
______ is a design feature of human language that enables speakers to talk about a wide range of things, free from barriers caused by separation in time and space.
A．Displacement
B．Arbitrariness
C．Duality
D．Productivity
单项选择题
The distinction between competence and performance is proposed by ______.
A．Saussure
B．Halliday
C．Chomsky
D．the Prague School
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