(
课件网) Unit 5 Water is life 主题范畴： 人与自然 主题群： 环境保护 子主题： 环境污染及原因，环保意识和行为 Key question What does water mean to us understand the usefulness and importance of water. identify some facts about water in daily life. explore how to save water and use it wisely. describe the relationship between water and the development of our society. Unit objectives 单元目标 I can: Lead in What do you know about water in our bodies Cross-curricular connection Biological science Water is important to life. About 55%–60% of the adult human body is water. Let’s find out more facts about water in the human body. The water in our bodies All living things need water. In fact, water is an important part of all plants and animals. For example, about 95% of the weight of a cucumber is water. For animals, that figure is usually around 60%. When we are born, about 70%–80% of our body weight is water. This number goes down as we grow up. For an adult man, water makes up about 60% of the body weight. The amount of water is a bit lower for women: around 55%. This is because women usually have more body fat than men. A lot of water leaves our bodies every day, so we need to replace it. Adults need to drink about 2–3 litres per day to stay healthy. Every time we go to the bathroom, we lose water. Every day, there is around 1.5 litres of water in our urine. If your urine is very yellow, you need to drink more water. The body also loses water to help it cool down. This is called sweat. We lose about 500 ml of water as sweat per day. It is normal to sweat a lot when we do sport or go out in hot weather. However, if we lose more than 5% of our body weight in water, we will get tired. It is dangerous to lose more than 10%. If that happens, we will feel ill. Remember to bring a water bottle every time you play sport! What is the main idea of the passage It mainly introduces the significance of water for living things and water in the human body. Read para. 1 and answer the question. All living things need water. In fact, water is an important part of all plants and animals. For example, about 95% of the weight of a cucumber is water. For animals, that figure is usually around 60%. How much of the weight of a cucumber is water About 95%. Read para. 2 and answer the question. When we are born, about 70%–80% of our body weight is water. This number goes down as we grow up. For an adult man, water makes up about 60% of the body weight. The amount of water is a bit lower for women: around 55%. This is because women usually have more body fat than men. Why women usually have more body fat than men Becaue the amount of water is a bit lower for women. Read para. 3 and answer the question. A lot of water leaves our bodies every day, so we need to replace it. Adults need to drink about 2–3 litres per day to stay healthy. Every time we go to the bathroom, we lose water. Every day, there is around 1.5 lit ... ...
