单项选择题

Black people were first brought to America from Africa as______.

A．workers in factories
B．cotton pickers
C．migrants
D．slaves
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单项选择题
The first settlement in Australia was made by the______.
A．English
B．Dutch
C．French
D．German
单项选择题
After the American Revolution,______became the first capital of the United States, being already the largest city in North America.
A．Philadelphia
B．New York
C．Boston
D．Virginia
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