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  3. Everywhere, water use is increasing. Humans already use fifty-four percent of all the fresh water in rivers, lakes and undergrou

Everywhere, water use is increasing. Humans already use fifty-four percent of all the fresh water in rivers, lakes and undergrou

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问题     Everywhere, water use is increasing. Humans already use fifty-four percent of all the fresh water in rivers, lakes and underground. There are some 【B1】______ that this rate will reach seventy percent by 2025. Fresh water is necessary for life on Earth. People need water for everyday activities and to【B2】______ food. Water also is important for energy production and the health of Earth’s【B3】______ systems.
    The United Nations is organizing a 【B4】______ of events to increase concern about water issues. UN officials have declared 2003 the International Year of Fresh Water. A goal of the【B5】______ is to build support for policies to use water more wisely. Another goal is to get more people to use water in ways that will not【B6】______ the environment. The world population is more than six thousand million people. More than one thousand million lack safe drinking water. More than two thousand million suffer from 【B7】______ linked to dirty water. And, more than two thousand million live without waste-treatment【B8】______ .
    Water was one of the issues discussed at the LIN Millennium Summit two years ago.【B9】______ .Officials renewed that goal last year at the Summit on Sustainable Development, in Johannesburg, South Africa.【B10】______ Nitin Desai directs the LIN Office for Economic and Social Affairs. He says success in these goals will require major changes in the ways people use water. He says【B11】______ .
【B10】
选项
答案They also promised to cut in half the number of people without safe systems to treat waste by 2015
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