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.
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