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A．Gravel.
B．Asphalt.
C．Macadam.
D．Concrete.
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单项选择题The novel A Tale of Two Cities was written by ________.

A．Charles Dickens
B．Mark Twain
C．George Eliot
D．Oscar Wilde

单项选择题The _________ is a major river of North Americ

A． SeineB. ThamesC. MississippiD. Danube