单项选择题

Christopher Columbus discovered the North American continent in __________ .

A．1592
B．1620
C．1492
D．1420
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单项选择题
The two leading parties of America are __________ .
A．The Republican and the Liberal
B．The Democratic and the Republican
C．The Democratic and the Conservative
D．The Democratic and the Labor
单项选择题
__________ made the important distinction between linguistic competence and linguistic performance.
A．Hymes
B．Labov
C．Halliday
D．Chomsky
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