题目内容
____________ of earth's liquid water is saltwater.
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Household water accounts fro only _______ of humanity's water consumption.
Agriculture currently covers ______ of earth's land area posing the biggest threat to our regional water supplies.
3% of potentially usable freshwater only less than ______ available for sustainly all life on earth.
___________ goes to the wide range of factories which make the products we buy each day.
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