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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 plants.
A．Uses of cold sea water.
B．Irrigating desert areas.
C．Techniques for preserving the environment.
D．Techniques of cultivating plants.
单项选择题
A．Exploration.B．Increase oil production.C．Alternative sources of energy.D．Not of above all.
A．Exploration.
B．Increase oil production.
C．Alternative sources of energy.
D．Not of above all.
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