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  3. 　　Humanity uses a little less than half the water available worldwide. Yet occ

　　Humanity uses a little less than half the water available worldwide. Yet occ

游客2024-11-05  39
问题 　　Humanity uses a little less than half the water available worldwide.
Yet occurrences of shortages and droughts are causing famine in some
areas, but industrial and agricultural by-products are polluting water supplies.             【S1】________
Since the world’s population is expecting to double in the next 50 years,                    【S2】________
many experts think we are on the edge of a widespread water crisis.
    But that doesn’t have to be the outcome. Water shortages do not
have to trouble the world—if we started valuing water more than we                          【S3】________
have in the past Just like we began to appreciate petroleum more after                       【S4】________
the 1970s oil crisis, today we must start looking at water from a fresh
economical perspective. We can no longer afford to consider water a                          【S5】________
virtual free resource of which we can use as much as we like.                                【S6】________
    Instead, for all uses except the domestic demand of the poor,
governments should price water to reflect their actual value. This means                     【S7】________
charging a fee for the water itself as well as for the demand costs.                         【S8】________
    Governments should also protect this resource by providing
water with more economically and environmentally sound ways.                                 【S9】________
Often the cheapest way to provide irrigation water in the dry tropics
is through small-scaled projects, such as gathering rainfall in depressions                  【S10】________
and pumping it to nearby cropland. [br] 【S6】
选项
答案 Virtual→VirtuaIly
解析 词性误用。此句中的virtual修饰形容词free，而不是名词resource，所以这里要用其副词形式，即virtually。
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