单项选择题

Crops can be produced in desert only because ______.

A．there is a lot of rain
B．there is one reservoir
C．the people work together for the benefit of all
D．many wells have been found
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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
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
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