单项选择题

A．Go to the library.
B．Meet the woman.
C．See Professor Smith.
D．Have a drink in the bar.
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单项选择题
A．About 35,000.B．About 250,000.C．About 350,000.D．About 25,000.
A．About 35,000.
B．About 250,000.
C．About 350,000.
D．About 25,000.
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.
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