单项选择题

A．Around 1400.
B．Around 1900.
C．Around 900.
D．Around 400.
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单项选择题
A．They enjoy loud music.B．They seldom lose their temper.C．They want to have children.D．They enjoy modem dances.
A．They enjoy loud music.
B．They seldom lose their temper.
C．They want to have children.
D．They enjoy modem dances.
单项选择题
A．By observation.B．By prediction.C．By recording.D．By examination
A．By observation.
B．By prediction.
C．By recording.
D．By examination
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