单项选择题

How many states are there in the United States

A．Thirteen.
B．Fifty.
C．Fifty one.
D．Sixty.
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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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NASA is an independent department in America for the studies of______.
A．science and technology
B．agriculture
C．aeronautics and space
D．industry
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