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 san
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单项选择题
A．Garbage from food.B．Old cars.C．Empty bottles.D．Bottle glass.
A．Garbage from food.
B．Old cars.
C．Empty bottles.
D．Bottle glass.
单项选择题
A．We should read first.B．We should spell first.C．We should listen first.D．We should write first.
A．We should read first.
B．We should spell first.
C．We should listen first.
D．We should write first.
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