单项选择题

A．For the sake of their health.
B．For the maintenance of the heating or the air-condition.
C．To make best use of their resources.
D．To make full use of the heating or the air-condition.
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单项选择题
A．The man should pay for the dinner.B．The woman is going to treat the man.C．They should go Dutch.D．The man should be more generous.
A．The man should pay for the dinner.
B．The woman is going to treat the man.
C．They should go Dutch.
D．The man should be more generous.
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