单项选择题

A．More than 12.
B．12.
C．100.
D．Not mentioned.
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单项选择题
A．To wear jackets to work.B．Not to use air-conditioners.C．To wear shirt sleeves.D．To take all measures to conserve energy.
A．To wear jackets to work.
B．Not to use air-conditioners.
C．To wear shirt sleeves.
D．To take all measures to conserve energy.
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