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(共25张PPT)
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 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.
How much water do we need to drink every day to stay healthy
Adults need to drink about 2–3 litres per day to stay healthy.
Read para. 4 and answer the question.
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 will happen if we lose more than 5% of our body weight in water
We will get tired.
Read the article again and complete the notes below.
about 70%-80%
about 60%
about 55%
1.5
0.5
What else does the body use water for
作为溶剂：
水是一种良好的溶剂，许多营养物质如葡萄糖、氨基酸、维生素等都需要溶解在水中才能被人体吸收和运输到各个组织器官。同时，代谢废物如尿素、尿酸等也需要通过水的溶解才能随尿液等排出体外。
参与化学反应：
水直接参与人体的许多生化反应，如水解反应、氧化还原反应等。例如，在食物的消化过程中，水参与淀粉、蛋白质、脂肪等大分子物质的水解，将其分解为小分子物质，以便人体吸收利用。
调节体温：
水的比热较大，能够吸收和释放大量的热量而自身温度变化相对较小。当人体产生热量过多时，水分通过皮肤表面的汗液蒸发带走热量，从而维持体温的相对稳定。在寒冷环境中，水又能减缓体温的散失，起到保暖作用。
Making a presentation for World Water Day
World Water Day (22 March) is about helping people without access to safe water. In this project, you are going to work in groups and make a presentation on the topic “Water is life” for World Water Day.
Step 1 Collect different facts about water and make a fact sheet.
Step 2 Discuss how important water is in our lives and for society. Find evidence to support your opinions.
Step 3 Discuss the different uses of water, and how we can save water. You may refer to pages 75–76 for help.
Step 4 Organize your ideas in a logical way and give your presentation to the class.
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.
Notes
事实上
长大
组成
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!
降温
变得疲惫
Eating more ________ is good for your health.
The ________ on the paper showed a steady increase in sales.
Children need a lot of love and care to ________.
________ is an important part of our diet.
If you feel hot, you will ________.
选词填空：
figure, cucumber, grow up, sweat, fat
cucumber
figure
grow up
Fat
sweat
句子翻译
水约占我们体重的 60%。
Water makes up about 60% of our body weight.
我们可以用豆腐替代肉。
We can replace meat with tofu.
保持正常的作息很重要。
It’s important to keep a normal daily-routine.
Thank you!

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