单项选择题

By ______ we mean there is no logical connection between meanings and sounds.

A．arbitrary
B．duality
C．displacement
D．productivity
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单项选择题
In the 1960s pop music underwent a revolution when ______ became world famous and turned their home town of Liverpool into a place of pilgrimage.
A．the Beach Boys
B．the Rolling Stone
C．the Animals
D．the Beatles
单项选择题
Linguistics use ______ to refer to the abstract linguistic system shared by the members of a speech community.
A．langue
B．parole
C．symbol
D．common knowledge
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