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
In dry weather the farmers who live higher up the valley ______.
A．share the water with their neighbours
B．keep all the water for themselves
C．build canals across the fields of other farmers
D．work hard to store water
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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