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更新日:平成24年5月25日

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Fujinokuni Nature Quiz

Question51 Western/Hamanako

This is a picture of the biggest lake in Shizuoka Prefecture, Lake Hamana. When a domestic waste water flows into the lake and turns it into a dirty gray lake, how many days would it take until the entire water will be replaced and become clean again?


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About 5 days About 7 days About 12 days
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