資源簡介

(共25張PPT)
Unit 5 Water is life
主題范疇：
人與自然
主題群：
環(huán)境保護
子主題：
環(huán)境污染及原因，環(huán)保意識和行為
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 單元目標
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
作為溶劑：
水是一種良好的溶劑，許多營養(yǎng)物質(zhì)如葡萄糖、氨基酸、維生素等都需要溶解在水中才能被人體吸收和運輸?shù)礁鱾€組織器官。同時，代謝廢物如尿素、尿酸等也需要通過水的溶解才能隨尿液等排出體外。
參與化學(xué)反應(yīng)：
水直接參與人體的許多生化反應(yīng)，如水解反應(yīng)、氧化還原反應(yīng)等。例如，在食物的消化過程中，水參與淀粉、蛋白質(zhì)、脂肪等大分子物質(zhì)的水解，將其分解為小分子物質(zhì)，以便人體吸收利用。
調(diào)節(jié)體溫：
水的比熱較大，能夠吸收和釋放大量的熱量而自身溫度變化相對較小。當人體產(chǎn)生熱量過多時，水分通過皮膚表面的汗液蒸發(fā)帶走熱量，從而維持體溫的相對穩(wěn)定。在寒冷環(huán)境中，水又能減緩體溫的散失，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
事實上
長大
組成
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!
降溫
變得疲憊
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 ________.
選詞填空：
figure, cucumber, grow up, sweat, fat
cucumber
figure
grow up
Fat
sweat
句子翻譯
水約占我們體重的 60%。
Water makes up about 60% of our body weight.
我們可以用豆腐替代肉。
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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