单项选择题

A．By using satellite images, maps, etc.
B．By studying specific arming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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单项选择题
A．Stay at home and review the lesson.B．Stay at home and have a good rest.C．Go somewhere else.D．Go to the concert tomorrow.
A．Stay at home and review the lesson.
B．Stay at home and have a good rest.
C．Go somewhere else.
D．Go to the concert tomorrow.
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.
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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