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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 senate in Britain is older.B．There are more senate members.C．The senate in US is more practical.D．The senate in Britain is not elected.
A．The senate in Britain is older.
B．There are more senate members.
C．The senate in US is more practical.
D．The senate in Britain is not elected.
单项选择题
Which of the following best expresses the author’’s main concern
A．Photography as a fine art.
B．Modernism and Expressionism.
C．Photographers’’ attitude toward art.
D．Methods of modern photographers.
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