Unit 3 The environment and us. Lesson 17 课件（18张PPT）

课件18张PPT。 Lesson 17 Water
I am a home for the fish.
I am rain for the earth.
I am a drink for people.
I am ice, snow, pools, puddles.
I am river, lake, pond, sea and ocean.
Who am I?Can you guess?waterWater is very _____ on the earth.70%50%90%How much water is there on the earth?largeRead silently about para.1 and ask some questions.WhereWhoHow muchWhatHow manyWhy1. How many kinds of water are there on the earth? What are they?
2. What is salt water? What is fresh water? How much are they?
Questions:How many kinds of water are there on the earth? What are they?
There is salt water and fresh water on the earth.Read and answer
What is salt water? What is fresh water? How much are they?
Salt water is water from seas and oceans, 97% of water is salt water.
Fresh water is water from rivers and lakes. 3% of water is fresh water.
Read and answerPeoplewashcleanmake powerdrinkswimcookwater cropsPeople need water to…make power(发电）water crops点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本People waste water when they keep water running.点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本People waste water when they water plants.点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本People make water dirty when they throw trash into rivers.点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本点击此处添加文本People make water dirty when they throw trash into lakes.What should we do? save waterkeep water clean
Group Work: Talk about how to save water.
Tips: 1. Four students make a group and talk about simple steps to save water.
2. Write down at least two ideas.
3. Choose one student to report.

(1)Retell the text according to the Board Writing.(2)Tell your friends or families your ideas on saving water.Homework: