单项选择题

What is this passage mainly about

A．Demonstrating the serious weather condition around Lake Chad.
B．Introducing people's activity around Lake Chad.
C．Analyzing of the factors that cause water decreases in Lake Chad.
D．Introducing scientists' work about water condition in Lake Cha

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单项选择题

What is scientists' attitude towards the future of Chad Lake

A．Pessimism.
B．Hopeful.
C．Indifferent.
D．Doubtful.

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A．The related programs on the computer were out of date.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.