单项选择题

A．Garbage from food.
B．01d cars.
C．Empty bottles.
D．Bottle glass.
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单项选择题
A．Two ways.B．Three ways.C．Four ways.D．Five ways.
A．Two ways.
B．Three ways.
C．Four ways.
D．Five ways.
单项选择题
A．By using satellite images, maps, etc.B．By studying specific farming methods.C．By studying the variation of human population.D．By analyzing the quality of crops.
A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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