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 plants.
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单项选择题
A．Language courses.B．Universities.C．British and American English.D．Literature courses.
A．Language courses.
B．Universities.
C．British and American English.
D．Literature courses.
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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