单项选择题

passage One
Questions 26 to 28 are based on the passage you have just heard.

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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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.

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

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intended

passage OneQuestions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

passage One
Questions 26 to 28 are based on the passage you have just heard.