By Jeanne Perez,2014-04-17 12:11
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Source of life, each drop precious Good afternoon, ladies and gentlemen. I am Wang Yi from Pinggu Middle School Attached Beijing Normal University. I am very happy to be here. Today the topic of my speech is: Source of life, each drop precious. The water is the origin of life; however there are many kinds of water: green pond water, coo..

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