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.
单项选择题
A．The answer is close but not exactly correct.B．The answer is totally out of target.C．The answer is really correct.D．The answer is too obvious.
A．The answer is close but not exactly correct.
B．The answer is totally out of target.
C．The answer is really correct.
D．The answer is too obvious.
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