4. Approximately what percentage of the water on Earth is freshwater? A. 0.1% B, 3% C. 25% D. 50%




5. What is the use of most of the freshwater on Earth? A. agricultural B. drinking C. Industrial D. recreation

6. Where does most of our drinking water consumed at home come from? A. desalinated water C. surface water B. groundwater D. all of these


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