单项选择题

People shouldn't smoke unless

A．they are having public meetings
B．in buses or ball-rooms
C．invited by the hostess near the end of the meal to do so
D．they walk on the street
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单项选择题
A reservoir is used ______.
A．to keep the fields wet
B．to store water
C．to join canals
D．to prevent farmers from getting water
单项选择题
Co-opration means ______.
A．working for others
B．working for oneself
C．working together for the interests of all
D．working together for the benefit of the whole world
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