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水 , 生命之源
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公元 5000 年，人类与水 ••••••. 水 , 生命之源. 猜想 1. 地球已经没有可供人类使用的水资源，人们利用化学反应生成水。. 猜想 2. 科技发达，通过批量液化空气，生成水。. 猜想 3. 人类突变进化，不需要液态水，或者不需要水。. 猜想 4. 没有 科技、没有进化，可用水资源越来越少，地球人类走向灭亡。. 公元 2014 年 ， 节约 用水，点滴做起，善 存. 未来 •••••. 国家节水标志. 如何节水？. 一 水多用. 生活、学习中，你们会怎样“一水多用” •••••. 节水器具. 生活 中，你们用过哪些节水器具？.
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水 , 生命之源
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