单项选择题

What is scientists' attitude towards the future of Chad Lake

A．Pessimism.
B．Hopeful.
C．Indifferent.
D．Doubtful.
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单项选择题
Why do the 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A．The related programs on the computer were out of date.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.
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 built irrigation systems.
C．They carried water from other areas.
D．They utilize sea water near this are
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