单项选择题

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
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The _________ is a major river of North Americ
A． SeineB. ThamesC. MississippiD. Danube
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