单项选择题
Passage One
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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.50.B.51.C.15.D.Never stop.
A.50.
B.51.
C.15.
D.Never stop.
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填空题
G
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