单项选择题

Passage One

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.
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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