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．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.
单项选择题
A．Where is the manager nowB．Who will be his new managerC．Whether his manager is ill.D．When the manager will go to the headquarters.
A．Where is the manager now
B．Who will be his new manager
C．Whether his manager is ill.
D．When the manager will go to the headquarters.
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