[填空题]Humanity uses a little less than half the water available worldwide.
Yet occurrences of shortages and droughts are causing famine in some
but industrial and agricultural by-products are polluting water supplies. (1) ___
Since the world’s population is expecting to double in the next 50 years, (2) _
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 (3) _
have in the past. Just like we began to appreciate petroleum more after (4) _
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 (5) _
virtual free resource of which we can use as much as we like. (6) ___
Instead, for all uses except the domestic demand of the poor,
governments should price water to refle

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[填空题]Humanity uses a little less than half the water available worldwide.
Yet occurrences of shortages and droughts are causing famine in some
but industrial and agricultural by-products are polluting water supplies. (1) _____
Since the world’s population is expecting to double in the next 50 years, (2) _____
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 (3) _____
have in the past. Just like we began to appreciate petroleum more after (4) _____
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 (5) _____
virtual free resource of which we can use as much as we like. (6) _____
Instead, for all uses except the domestic demand of the poor,
governments should price water to refle

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