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set。
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单项选择题
A．Uses of cold sea water.B．Irrigating desert areas.C．Techniques for preserving the environment.D．Techniques of cultivating
A．Uses of cold sea water.
B．Irrigating desert areas.
C．Techniques for preserving the environment.
D．Techniques of cultivating
单项选择题
A．To other European countries.B．To the remote areas and suburbs.C．To the natural parks for birds.D．Back to their nests.
A．To other European countries.
B．To the remote areas and suburbs.
C．To the natural parks for birds.
D．Back to their nests.
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