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  3. What is this passage mainly about? Why do the computer data become imprecise in 1980s?

What is this passage mainly about? Why do the computer data become imprecise in 1980s?

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问题 What is this passage mainly about?
Why do the computer data become imprecise in 1980s?
选项 A、The related programs on the computer were out of date.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.
答案D
解析 客观事实题。关键语句:"The researchers major irrigation systems were built in the 1980s. The systems took water from two rives that flow into Lake Chad. The Chari and Logone ricers 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."可见一方面是湖区水源抽取过多,另一方面是天气情况变得恶劣,D正确。A,C在文中均未提及。B不应是directly, 且用于drink也不妥当。
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