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.
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单项选择题
A．The book has been sold.B．The book has been lost.C．The book has been reserved.D．The book has been borrowed by the professor.
A．The book has been sold.
B．The book has been lost.
C．The book has been reserved.
D．The book has been borrowed by the professor.
单项选择题
A．He read the newspaper.B．One of his students told him.C．He listened to a radio report.D．He attended a cabinet meeting.
A．He read the newspaper.
B．One of his students told him.
C．He listened to a radio report.
D．He attended a cabinet meeting.
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