单项选择题

A．By fuming them farming.
B．By affecting the quality of soil.
C．By adding chemicals and polluting the waterways.
D．By affecting the environments they live in.
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单项选择题
A．By good sense of water waves made by quarries.B．By good sense of smell and electrical and magnetic power.C．By good sense of light.D．By good sense of blood.
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical and magnetic power.
C．By good sense of light.
D．By good sense of blood.
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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