单项选择题

Which is the most important crop in America

A．Corn.
B．Rice.
C．Barley.
D．Oat.
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单项选择题
______refers to the abstract lingusitic system shared by all the members of a speech community.
A．Parole
B．Langue
C．Competence
D．Performance
单项选择题
Which does NOT belong to the judicial systems provided by the American Federal Government
A．The Supreme Court.
B．Magistrates' Court.
C．The Courts of Appeals.
D．The District Court.
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