单项选择题

A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of blood.
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单项选择题
A．Two hours.B．Four hours.C．Six hours.D．Eight hours.
A．Two hours.
B．Four hours.
C．Six hours.
D．Eight hours.
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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