单项选择题

A．The beginning of the United States.
B．The American Civil War.
C．The 19th century.
D．It’’s unclear.
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单项选择题
A．A sailor who is good at using solar energy.B．An Australian inventor.C．A ferry that uses solar and wind power.D．A new type of generator designed by Dane.
A．A sailor who is good at using solar energy.
B．An Australian inventor.
C．A ferry that uses solar and wind power.
D．A new type of generator designed by Dane.
填空题
ancient
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