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

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问题    Humanity uses a little leas 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.【M1】______
Since the world’s population is expecting to double in the next 50 years,    【M2】______
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          【M3】______
have in the past. Just like we began to appreciate petroleum more after       【M4】______
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          【M5】______
virtual free resource of which we can use as much as we like.                【M6】______
Instead, for all uses except the domestic demand of the poor,
governments should price water to reflect their actual value. This means       【M7】______
charging a fee for the water itself as well as for the demand costs.          【M8】______
Governments  should also protect this resource by providing
water with more  economically and environmentally sound ways.                【M9】______
Often the cheapest way to provide irrigation water in the dry tropics
is through small-scaled projects, such as gathering rainfall in depressions    【M10】______
and pumping it to nearby cropland. [br] 【M8】

选项

答案 demand→supply

解析用词错误。本行的charging a fee的施动者是governments，因此表目的的for结构说明的应该是政府的“供应”成本，而不是“需求”成本。

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