单项选择题

A．Pick out all the glass and metal.
B．Get rid of dust.
C．Burn waste paper.
D．Screen earth and sand.
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单项选择题
A．The relationship between man and his environment.B．The relationship between living things and their environment.C．The relationship between man and living things.D．The relationship between man’s brain and other living things.
A．The relationship between man and his environment.
B．The relationship between living things and their environment.
C．The relationship between man and living things.
D．The relationship between man’s brain and other living things.
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