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.
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单项选择题
A．It often comes about every five minutes.B．It often comes about every six minutes.C．It often comes about every seven minutes.D．It often comes about every eight minutes.
A．It often comes about every five minutes.
B．It often comes about every six minutes.
C．It often comes about every seven minutes.
D．It often comes about every eight minutes.
单项选择题
A．As funny.B．As dishonest.C．As foolish.D．As polite.
A．As funny.
B．As dishonest.
C．As foolish.
D．As polite.
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