单项选择题

When he was a boy, Mark Twain dreamed of traveling on river boats to （）.

A．become a riverboat pilot
B．gather material for his books
C．make money
D．enjoy himself

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填空题
A．usual B．useful C．just D．mistake
单项选择题
Who were the earliest people living in North America（）

A．The Spanish.
B．The English.
C．The Negroes.
D．The Indians.
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