单项选择题

A．Garbage Can Be Changed into Fertilizer.
B．Overcoming the Problem of Waste.
C．Making Buildings with Garbage.
D．Large Cities Are Anything but Beautiful.
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单项选择题
A．Only breakfast.B．Only lunch.C．Only night-meals.D．All of the above.
A．Only breakfast.
B．Only lunch.
C．Only night-meals.
D．All of the above.
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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