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
Co-operation 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
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
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