【正文】 governments, for instance, would be better off building smallscale dams rather than huge and disruptive projects like the one that ruined the Aral Sea. 中國(guó)最大的管 理 資料下載中心 (收集 \整理 . 大量免費(fèi)資源共享 ) 第 8 頁(yè) 共 43 頁(yè) “ More than 1 billion people worldwide don’ t have access to basic clean drinking water,” says Gleick. “ There has to be a strong push on the part of everyone— governments and ordinary people— to make sure we have a resource so fundamental to life.” 提示 :在實(shí)考試卷中， 810 題在答題卡 1 上。 2. 支教活動(dòng)的意義。 NG(for NOT GIVEN)if the information is not given in the passage. For questions 810,plete the sentences with information given in the passage. Will We Run Out of Water? Picture a “ ghost ship” sinking into the sand, left to 中國(guó)最大的管 理 資料下載中心 (收集 \整理 . 大量免費(fèi)資源共享 ) 第 3 頁(yè) 共 43 頁(yè) rot on dry land by a receding sea. Then imagine dust storms sweeping up toxic pesticides and chemical fertilizers from the dry seabed and spewing them across towns and villages. Seem like a scene from a movie about the end of the world? For people living near the Aral sea (咸海 ) in Central Asia, it’ s all too real. Thirty years ago, government planners diverted the rivers that flow into the sea in order to irrigate (provide water for ) farmland. As a result, the sea has shrunk to half its original size, stranding (使擱淺 ) ships on dry land. The seawater has tripled in salt content and bee polluted, killing all 24 native species of fish. Similar largescale efforts to redirect water in other parts of the world have also ended in ecological crisis, according to numerous environmental groups. But many countries continue to build massive dams and irrigation systems, even though such projects can create more problems than they fix. Why? People in many parts of the world are desperate for water, and more people will need more water in the next century. “ Growing populations will worsen problems with wate 中國(guó)最大的管 理 資料下載中心 (收集 \整理 . 大量免費(fèi)資源共享 ) 第 4 頁(yè) 共 43 頁(yè) r,” says Peter , an environmental scientist at the Pacific Institute for studies in Development, Environment, and Security, a research anization in California. He fears that by the year 2025, as many as onethird of the world’ s projected (預(yù)測(cè)的 ) billion people will suffer from water shortages. WHERE WATER GOES Only percent of all water on Earth is freshwater, water suitable for drinking and growing food, says Sandra Postel, director of the Global Water Policy Project in Amherst, Mass. Twothirds of this freshwater is locked in glaciers (冰山 ) and ice caps （冰蓋） . In fact, only a tiny percentage of freshwater is part of the water cycle, in which water evaporates and rises into the atmosphere, then condenses and falls back to Earth as precipitation (rain or snow). Some precipitation runs off land to lakes and oceans, and some bees groundwater, water that seeps into the earth. Much of this renewable freshwater ends up in remote places like the Amazon river basin in Brazil, where few people live. In fact, the world’ s population has access to only 12,500 cubic kilometers of freshwat 中國(guó)最大的管 理 資料下載中心 (收集 \整理 . 大量免費(fèi)資源共享 ) 第 5 頁(yè) 共 43 頁(yè) er— about the amount of water in Lake Superior(蘇必利爾湖 ). And people use half of this amount already. “ If water demand continues to climb rapidly,” says Postel, “ there will be severe shortages and damage to the aquatic (水的 ) environment.” CLOSE TO HOME Water woes(災(zāi)難 ) may seem remote to people living in rich countries like the United States. But Americans could face serious water shortages, too especially in areas that rely on groundwater. Groundwater accumulates in aquifers (地下蓄水層 )， layers of sand and gravel that lie between soil and bedrock. (For every liter of surface water, more than 90 liters are hidden underground.) Although the United States has large aquifers, farmers, ranchers, and cities are tapping many of them for water faster than nature can replenish(補(bǔ)充 ) it. In northwest Texas, for example, overpumping has shrunk groundwater supplies by 25 percent, according to Postel. Americans may face even more urgent problems from pollution. Drinking water in the United States is generally safe and meets high standards. Nevertheless, one in 中國(guó)最大的管 理 資料下載中心 (收集 \整理 . 大量免費(fèi)資源共享 ) 第 6 頁(yè) 共 43 頁(yè) five Americans every day unknowingly drinks tap water contaminated with bacteria and chemical wastes, according to the Environmental Protection Agency. In Milwaukee, 400,000 people fell ill in 1993 after drinking tap water tainted with cryptosporidium (隱孢子蟲(chóng) )， a microbe (微生物 ) that causes fever, diarrhea (腹瀉 ) and vomiting. THE SOURCE Where so contaminants e from? In developing countries, people dump raw (未經(jīng)處理的 ) sewage(污水 ) into the same streams and rivers from which they draw water for drinking and cooking。 TV shows promote m 中國(guó)最大的管 理 資料下載中心 (收集 \整理 . 大量免費(fèi)資源共享 ) 第 19 頁(yè) 共 43 頁(yè) ental gymnastics by 51 viewers to follow plex story lines. But books offer experience that can’ t be gained from these other sources, from52 vocabulary to stretching the imagination. “ If they’ re not r