单项选择题

A．Soil.
B．Human population.
C．Forest.
D．Water.
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单项选择题
A．Because it is open to everyone.B．Because there is no entrance examination.C．Because it doesn’’t have any gate.D．Because it never closes.
A．Because it is open to everyone.
B．Because there is no entrance examination.
C．Because it doesn’’t have any gate.
D．Because it never closes.
单项选择题
A．Their term.B．Their duties.C．Their function.D．Their composition.
A．Their term.
B．Their duties.
C．Their function.
D．Their composition.
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