冀教版：Unit_5_lesson_25_Let’s_Do_an_Experiment课件

1、Langguang Middle SchoolDang Lesson 25 Lets Do an Experiment! 1. experiment n.实验实验;试验试验 2. jar n. 广口瓶广口瓶; 罐子罐子 3. upside n.上部上部;上边上边 4. pour v.倒出；倾倒倒出；倾倒 5. correct adj. 正确的；恰当的正确的；恰当的 6. scientific adj. 科学的科学的 7.method n.方法方法; 办法办法 8.raincoat n. 雨衣雨衣 9.force n.力量力量 v.迫使；强迫迫使；强迫 10.pressure n. 压力，压强；

2、挤压压力，压强；挤压 11.conclude v. 得出结论；断定；推动出得出结论；断定；推动出Difficult and important points 1 fill with 的用法 2 turnupside down 的含义 3 prove 的用法 4 辨析way与method 的用法Teaching aims 词汇 science experiment fill prove scientific method fill/coverwith turn upside down right side up 交际用语 1. lm not sure 2.Maybe you should do

3、this experiment outside,Brian3.lm sure the floor wont get Main Sentences 1. I fill a jar with water. 我用水把瓶子装满。我用水把瓶子装满。 zxxk fill with用用装满装满 He has filled his case with many books. 他已经把书装满了箱子。他已经把书装满了箱子。 coverwith 用用盖住盖住2. I turn the jar upside down. 我把广口瓶倒置。我把广口瓶倒置。upside down 的意思是的意思是“向下翻转过向下翻转过来来

4、”. You hold the book upside down. zxxk 你把书拿倒了。你把书拿倒了。right side up 是是“正面朝上正面朝上”的意思的意思be sure +that 从句表示从句表示“认为认为一定一定” 而而be not sure 表示不确定表示不确定.e.g. Im sure she will come here. 我确我确信她会来。信她会来。 Im not sure when hell come here. 我我不能肯定什么时候来这儿。不能肯定什么时候来这儿。3. Im sure the floor wont get wet. 我确信地板不会湿。我确信地板不

5、会湿。4. Well do the experiment and observed what will happen.我们将做这个实验并观察会发生什么情况。我们将做这个实验并观察会发生什么情况。 observed 动词动词, “观察观察”。 observe sb. do/ doing sth. 如：如： I observed her dance.When I passed by the grass, I observed himW Lets do an interesting experiment. First, I _ a jar _a desk, _it _ water, then _th

6、e top _ a piece of cardboard. When I _the jar _ _, can you guess what will happen? The force of air will keep the water in the jar. 1. Whats the meaning of the word “theory”? 2.Whats the meaning of the word “experiment”? 3.What does Brian do about the experiment at first ? 4.Why does Danny want to d

7、o the experiment outside? 5.Will Brian do the experiment inside? What does Jenny say?Listen again and answer more 1. Whats the meaning of the word “theory”? A “theory” is an idea. A theory predicts what will happen. 2.Whats the meaning of the word “experiment”? An “experiment” shows what happens. An

8、swer the 3.What does Brian do about the experiment at first ? He read about the experiment. He filled the jar with water,covered the top with a piece of cardboard, and then he turned it upside down. Listen again and answer more 4.Why does Danny want to do the experiment outside? Danny is not sure wh

9、ether the floor will get wet? Listen again and answer more 5.Will Brian do the experiment inside? Yes. He is sure the floor wont get wet. What does Jenny say? Lets do the experiment and see what happens.Listen again and answer more Work in groups and think of this experiment .Discuss it and write do

10、wn how we did it.Step 1 Preparation: Make a list of the materials and tools that we were used in the experiment. Step 2 Theories: Write down two different theories. 1. The floor will get wet. 2. The floor wont get wet. Water,a jar , a piece of Step 3 Main steps:Write down the steps of doing the expe

11、riment1. Fill a jar with water.2. Cover the top with a piece of cardboard.3. Turn the jar upside down.Step 4 Result: Write down the result of the experiment. The force of air will keep the water in the 选择与划线部分意思相同或相近的词。选择与划线部分意思相同或相近的词。1. Is the theory right or wrong? A. idea B. way C. mind D. answe

12、r2. Dont turn the bottle upside down. A. away B. off C. up D. over3. When I do the experiment, you must watch closely. A. learn B. know C. see D. observe4. - Excuse me! May I ask you a question? - Certainly. A. No B. Sorry C. Sure D. T Good-B A balloon is full of air. If we pierce(刺破刺破) it with a ne

13、edle, it will break with a loud bang. But if we put a piece of glue on the balloon and do the same experiment, what will happen? Surprisingly, we wont hear the same sound. The balloon will become smaller and smaller. We will feel that the air is running out slowly through the pinhole(针孔针孔). We know the balloon is made rubber(橡胶橡胶). When the balloon is pierced, the airleaving the balloon forms a kind of force. Rubber isso thin that it cant support(支撑支撑) such force. Sothe balloon breaks quickly with a loud bang. Butthe glue is diffe