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  3. Read the following article from a magazine and answer questions 19-25. For questions 19-25, choose the correct answer A, B,

Read the following article from a magazine and answer questions 19-25. For questions 19-25, choose the correct answer A, B,

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问题     Read the following article from a magazine and answer questions 19-25.
    For questions 19-25, choose the correct answer A, B, C or D.
    Mark your answer on the Answer Sheet.
    A Thirsty Planet
    If you live in a city in North America or Europe, you have probably never thought much about water. Whenever you need some, you turn on the tap and there it is. Millions of people in other parts of the world are not so lucky. They have trouble getting enough clean water for their basic needs. This situation may soon become common all around the world, scientists believe. In fact, they say that the lack of clean water may be one of the biggest issues in the twenty-first century.
    The reasons for this are clear. On the one hand, people are using more water than ever before. Over the last fifty years, the population of the world has more than doubled. So has the demand for water — for home use, for farming and for industry. On the other hand, supplies of clean water are disappearing. Many sources of surface water — such as rivers, lakes and streams — are too polluted and unhealthy for use as drinking water. This has forced more and more people to drill wells so they can get water from underground.
    There are enormous amounts of water deep underground in lakes called aquifers. Until recently, scientists believed this groundwater was safe from pollution. Then, in 1980s, people in the Untied States began to find chemicals in their well water, and scientists took a closer look at what was happening. Weldon Spring, Missouri, for example, was the site of a bomb factory during World War II. The factory was destroyed after the war, but poisonous chemicals remained on the ground. Very slowly, theses chemicals dripped down through the ground and into the aquifer. Once they did, however, the water from that aquifer was no longer drinkable.
    It probably never will be drinkable again. Groundwater is not renewed regularly by the rain, like lake or river water. Thus, if a harmful chemical gets into an aquifer, it will stay there for a very long time. Furthermore, it is nearly impossible to remove all the water in an aquifer and clean out the pollutants.
    Industrial sites like Weldon Spring are one cause of groundwater pollution. There are thousands of such sites in the Untied States alone, and many others around the world.
    Groundwater pollution is also caused by modern farming methods, which require the use of large amounts of chemicals in the fields. And finally, yet another important cause of groundwater pollution is waste. That includes solid waste thrown away in dumps and landfills, and also untreated human and animal waste.
    The situation is indeed very serious. Fortunately, there are many aquifers and they are very large. Only a small number have been seriously damaged so far. But if the world does not want to go thirsty in the near future, further pollution must be prevented. Around the world, governments must make real changes in industry, agriculture and waste disposal.
In the first paragraph scientists express the idea that ______.
选项 A、clean water is not necessary for millions of people
B、there will always be enough water for everyone
C、the water problem will soon be resolved
D、many more people may soon be without clean water
答案D
解析 第1段的开始说到北美和欧洲的居民可能从来没有想到过会没有水用，而本段倒数第2句话： “This situation may…world，scientists believe．”点出了会有更多的人缺乏干净的水源这一预测。
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