单项选择题

What did people do to solve the problem of rain lack around Chad Lake

A．They moved out of this area.
B．They drew water from Lake Chad.
C．They carried water from other areas.
D．They utilize seawater near this area.
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单项选择题
Which of the following is true according to this passage
A．Chad Lake located in the middle of Chad in northern Africa.
B．The water from Chad water can now only be used for irrigation.
C．The area around Chad Lake has suffered from heavy rain lack many decades.
D．Population around the Chad Lake now begins to decrease due to water lack.
单项选择题
Why computer data become imprecise in 1980s
A．The related programs on the computer were out of date.
B．More and more people drew water directly from the lake for drink.
C．A heavy rain happened around 1980.
D．The irrigation from the source water increases.
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