单项选择题

Why is Washington, D.C. the most important American city

A．It is the capital of the United States.
B．It is the largest in population.
C．It is the must beautiful city.
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单项选择题
Which state has the largest population
A．California.
B．Alaska.
C．Los Angeles.
单项选择题
How many states are there in the USA
A．Five.
B．Forty-five.
C．Fifty.
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