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.
单项选择题
A．Science benefits us but costs much.B．Science harms us but brings about no benefits.C．Science benefits and harms as well if out of control.D．Science can help make Better swords.
A．Science benefits us but costs much.
B．Science harms us but brings about no benefits.
C．Science benefits and harms as well if out of control.
D．Science can help make Better swords.
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