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Ss:Yes. T:OK.Now I have a riddle.Please guess it. (Teacher uses the multimedia to show the riddle on the screen.) It’s very important to all the animals and plants. It’s also important to human beings. It’s liquid at room temperature. Every day you keep in touch with it. You can’t live without it. (a thing) T:What’s it? Ss:It’s very easy.It’s water. T:Yeah,today we will talk about water.Now please tell me what you know about water. S1:Water is used to drink. S2:Water can be used to water the flowers. S3:I think water can be used to make electricity. CStep Ⅱ Warming up T:Thank you for your ideas.Next we will make some interesting experiments.Maybe you can learn more about water from the following experiments.Li Lei,would you like to come here to help me? S4:I’d love to. T:Now,look at Li Lei and me.We will begin.You should watch the experiment carefully and try to tell me what happens and why. (Teacher puts a bottle of water,a bottle of vegetable oil and an empty glass on the desk.) T:Li Lei,pour some water and some vegetable oil into the empty glass.Other students,please watch carefully. (A few seconds later.) Ss:Fantastic!The liquid in the glass has become two parts. T:Try to describe it in detail. S5:Let me try.The part above is vegetable oil and the part below is water.But I don’t know why. (责任编辑：admin) |