The computer study showed results similar to the recorded ones for the first twenty years. But there was a big change in the 1980s. At that time, the lake got smaller much faster than the computer research had estimated.

　　The researchers say major irrigation systems were built in the 1980s. The systems took water from two rivers that flow into Lake Chad. The Chari and Logone rivers carry most of the water that enters the lake. The study showed the increased irrigation reduced the flow in the two rivers. Climate changes also were responsible for the reduction. Today the flow of the two rivers has been reduced by almost seventy-five percent.

　　Scientists say the problem is expected to worsen in the coming years as the population and demand for water continue to increase.

　　1.What is this passage mainly about?

　　A) Demonstrating the serious weather condition around Lake Chad.

　　B) Introducing peoples 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 Chad.

　　2.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.

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