17. On Equality
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A dam is:
1 Built across a river at sites where one can collect a lot of water.
2 Built across a plateau at sites where one can collect a lot of water.
3 Built across a mountain at sites where one can collect a lot of water.
4 Built across a plain at sites where one can collect a lot of water.
Explanation:
Built across a river at sites where one can collect a lot of water.