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．To wear jackets to work.B．Nut to use air-conditioners.C．To wear shirt sleeves.D．To take all measures to conserve energy.
A．To wear jackets to work.
B．Nut to use air-conditioners.
C．To wear shirt sleeves.
D．To take all measures to conserve energy.
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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