|
Ss:The piece of paper doesn’t fall and the water in the glass doesn’t flow. T:Yes.You are right.Now you are given a few minutes to have a discussion about the reason for it. (Teacher gives students a few minutes to discuss,and then checks their answers.) T:Who can tell us the reason why the piece of paper doesn’t fall and the water doesn’t flow? S10:I want to have a try.When the glass of water covered with a piece of paper is turned upside down,the pressure from air to the piece of paper is bigger than the pressure from the water in the glass to the piece of paper.So the paper won’t fall and the water won’t flow. T:Excellent!Thank you for your explanation.I am very glad to see that you are all interested in making experiments.After class,you can carry out another two experiments on Page 17.When you perform them,try to describe what happens and why.OK? Ss:OK. T:Now,let’s look at a picture. (Teacher shows a picture on the screen.) T:What can you see? Ss:There is a river in the picture,but it’s very dirty. T:Anything else? S11:There are some plastic bags and empty tins on the surface of the river. T:Yes.We all know water is important to human beings and all the animals and plants.Unfortunately water is being polluted now.What do you think we can do to protect the water on our planet? (Teacher gives students enough time to prepare.When they prepare,teacher goes among the students to help them to express their ideas correctly.) Sample answer: To protect the water on our planet,I think we should save every drop of water and stop throwing rubbish into water.Besides,we should try our best to help the people around us realize the importance of using and protecting our water. CStep Ⅲ Listening T:Next,let’s do some listening.Turn to Page 18 and look at the Listening part.You can listen to the famous poems about life on the ocean.Listen carefully and write down some key words when you listen.Before you listen,let’s learn two phrases first.Look at the blackboard. 1.happen to e.g.What happened to you last week? If anything happens to the machine,please tell me. (责任编辑：admin) |