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ni zhi dao ma
Author(s): 
Pages: 32
Year: Issue:  9
Journal: Required Reading for Junior Middle School Students

Abstract: <正>●地球上的水只有2.53%是可供人类利用的淡水●占世界人口40%的80个国家面临水危机。●人类80%以上的疾病与饮用不洁水有关。●每年约有500万人死于饮用不清洁的水。●全世界有1/6的人口缺水。
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