单项选择题

A．In the 1790s.
B．In the 1970s.
C．In the 1870s.
D．In the 1750s.
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单项选择题
A．20%.B．55%.C．29%.D．31%
A．20%.
B．55%.
C．29%.
D．31%
单项选择题
A．24 years.B．80 years.C．12 years.D．20 years.
A．24 years.
B．80 years.
C．12 years.
D．20 years.
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