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Question
Why the flowing water of the river cannot be cleaned easily by natural process?
Options:
A .  Because a large number of external substances are discharged into the water
B .  Because external climatic conditions are not favorable to clean the water
C .  The following water is already cleaned before flowing itself
D .  Because of lack of space to clean the water
Answer: Option A
Answer: (a).Because a large number of external substances are discharged into the water

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