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१. जल प्रदुषण बारे सर्वप्रथम चर्चा गर्ने व्यक्ती को हुन् ?

  1. हिप्पोक्रेटस
  2. आर्थिनस
  3. रोनाल्ड रेगन
  4. जारोफ बफ

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