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Read the passage: Water is a precious resource. Although most of the Earth is covered with water, only a small percentage is fresh water suitable for human use. Conserving water is essential to prevent future shortages. Question: Why should we conserve water if most of the Earth is covered with it?

ABecause water is salty

BBecause only a small percentage is fresh and usable

CBecause water is expensive

DBecause we cannot swim in all of it