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
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单项选择题
The Red Badge of Courage was written by______.
A．Stephen Crane
B．Frank Norris
C．Theodore Dreiser
D．Jack London
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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