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Subject :NSO    Class : Class 6

Water pollution caused by drains could be avoided or reduced by ____.

ASpeedy disposal and proper treatment
BRegular servicing of vehicles and using clean fuels
CSewage treatment before disposal
DDischarging domestic waste into rivers.

Ans 1:

Class : Class 7
the answer is c

Ans 2:

Class : Class 8
the answer is c

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