单项选择题

A．Exploration.
B．Increase oil production.
C．Alternative sources of energy.
D．Not of above all.
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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．Driving a car.B．Taking a taxi.C．Going by train.D．Taking the subway.
A．Driving a car.
B．Taking a taxi.
C．Going by train.
D．Taking the subway.
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