单项选择题

Questions 32 to 35 are based on the passage you have just heard.

A．About 35,000.
B．About 250,000.
C．About 350,000.
D．About 25,000.
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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
northern
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