题目内容
My daughter was annoyed because I didn't turn off the water fast enough when we brushed our teeth one night.
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According to Richard Smalley, water is the most important and most contentious resource of the 21st century.
Water is taking place of energy as the top problem for humanity in this century.
Unlike coal and petroleum, water can not be replaced by other resources.
we have spent as much money looking for water on Earth as we did searching for it on Mars in the past decades.
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