听下面一段材料,回答第1-4题。 1. Where does the fresh water people need come from? A. Rivers and lakes. B. Underground. C. Both A and B. 2. How much water can we drink of all the water the world? A. 3%. B. 97%. C. 4%. 3. What is the speaker mainly talking about in this passage? A. The ways of getting fresh water. B. How to use fresh water in our daily life. C. AII people in the world should save water. 4. Which of the following is true? A. Hunger is the only problem in the world. B. Water shortage is the only problem in the world. C. Scientists have been working hard on solving water shortage.