单项选择题

A．50.
B．51.
C．15.
D．Never stop.
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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．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.
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