单项选择题

A．It is not theirs.
B．It has some problems.
C．It is out of warranty.
D．It was stolen.
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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.
填空题
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