[单项选择]

Water Resource

Humanity uses a little less than half the water available worldwide. Yet occurrences of shortages and droughts (干旱)are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies. Since the worlds population is expected to double in the next 50 years, 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 start valuing water more than we have in the past. Just as we began to appreciate petroleum more after the 1970s oil crises, today we must start looking at water from a fresh economic perspective. We can no longer afford to consider water a virtually free resource of which we can use as much as we like in any way we want.
Instead, for all uses except the domestic demand of the poor, governments should price water to refl
A. build big lakes to store water
B. construct big pumping stations
C. build small and cheap irrigation systems
D. channel water from nearby rivers to cropland

[单项选择]

Humanity uses a little less than half the water available worldwide. Yet occurrences of shortages and droughts (干旱)are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies. Since the worlds population is expected to double in the next 50 years, 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 start valuing water more than we have in the past. Just as we began to appreciate petroleum more after the 1970s oil crises, today we must start looking at water from a fresh economic perspective. We can no longer afford to consider water a virtually free resource of which we can use as much as we like in any way we want.
Instead, for all uses except the domestic demand of the poor, governments should price water to refl
A. Only half of the worlds water can be used.
B. The world population is increasing faster and faster.
C. Half of the worlds water resources have been seriously polluted.
D. Humanity has not placed sufficient value on water resources.

[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 po