单项选择题

A．At class.
B．Back at home.
C．At work.
D．In hospital.
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单项选择题
A．Red.B．Black.C．White.D．Not all of the abov
A．Red.
B．Black.
C．White.
D．Not all of the abov
单项选择题
A．Soil.B．Human population.C．Forest.D．Water.
A．Soil.
B．Human population.
C．Forest.
D．Water.
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