单项选择题

A．In 1809.
B．In 1818.
C．In the 1880s.
D．In the 1890s.
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单项选择题
Today leisure means the time in which we have nothing to do.
A．Y
B．N
C．NG
单项选择题
A．Two different types of bones in the human body.B．How bones help the body move.C．How bones continuously repair themselves.D．The chemical composition of human bones.
A．Two different types of bones in the human body.
B．How bones help the body move.
C．How bones continuously repair themselves.
D．The chemical composition of human bones.
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