单项选择题

The totality of linguistic varieties possessed by an individual constitutes his linguistic______.

A．performance
B．competence
C．capability
D．repertoire
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单项选择题
NASA is an independent department in America for the studies of______.
A．science and technology
B．agriculture
C．aeronautics and space
D．industry
单项选择题
Australia's National Day is______.
A．January 26.
B．July 14.
C．October 1.
D．December 24.
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