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【参考答案】

I：pratable。
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B：incidents。
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.
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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