新冀教版九年级全一册英语Lesson 25 Lets Do an Experiment课件

1、Lesson 25 Lets Do an Experiment ! Unit 5 Look into Science 学习目标Curriculum words: pour, correct, scientific, method, raincoat, force, pressure Useful expressions: I cover the top with a piece of cardboard and hold it there.I am so sure of my theory that Brian can do the experiment over your head and

2、I know you wont get wet.Functions: Master the new words: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude Grammar: be动词(am/is/are)动词的过去分词Sentences: The force of the air keeps the water in the jar. It is strong enough to hold the water.思 考新课导入思 考Do you l

3、ike doing experiments ? Why?新课讲解THINK ABOUT ITWhat kinds of experiments have you done in science class?If you hold a jar that is filled with water upside down，what will happen? Danny，Jenny and Brian are in the lab.Brian：Lets do an experiment. I fill a jar with water. I cover the top with a piece of

4、cardboard and hold it there. Then I turn the jar upside down课文呈现新课讲解 and take my hand off the cardboard. Can you guess what will happen?Danny：I think the floor will get wet. We should do this experiment outside，Brian.Jenny：I think the cardboard will hold the water.Danny：I dont think so.Jenny：You thi

5、nk the water will pour out，Danny. I think the water will stay in the jar. Lets test which theory is correct.新课讲解Brian：Good idea，Jenny. Thats called the scientific method.Jenny：I am so sure of my theory that Brian can do the experiment over your head and I know you wont get wet.Danny：Well，lets try it

6、!Brian：Are you ready，Danny?Danny：No! Wait! (He puts on a raincoat and sits down.) Now I think Im ready.Jenny：Brian，take your hand off the cardboard.新课讲解Danny：No! (Danny closes his eyes tightly，and Brian takes his hand off the cardboard. The water stays in the jar.)Jenny：See，Danny!Danny：How is that p

7、ossible?Brian：The force of the air keeps the water in the jar. It is strong enough to hold the water.Danny：Wow!Brian：So what have we discovered？新课讲解Jenny：We have discovered that the air pressure helps the cardboard hold the water in the jar.Brian：Right. What do you conclude，Danny?Danny：I conclude th

8、at air is stronger than I thought. 新课讲解Let s Do It !Read the lesson and answer the questions.1 1Where does Danny think they should do the experiment? 2What keeps the water in the jar? 3Is Jenny sure of her theory？How do you know? 4Why does Danny put on his raincoat? 5What does Danny conclude? Outsid

9、e. The force of air. Yes, she is. She asks Brian to do the experiment over Dannys head and she knows he wont get wet. He is afraid that he will get wet. He concludes that air is stronger than he thought. 新课讲解 Read the experiment. Put the sentences in the correct order.2Put a piece of cardboard over

10、the jar.The jar of water is upside down，but the water stays inthe jar. This is because air pressure pushes the cardboard onto the jar.Fill the glass jar with water.Turn the glass jar over quickly. Hold your hand on the cardboard for a few seconds.Remove your hand from underneath the jar. What happen

11、s?There is more air outside the jar than inside，so there is more air pressure outside than inside.251346新课讲解3Try to do the experiment in this lesson yourself. Task tips：What happens when you use less water， more water，wet cardboard，or different kinds and sizes of jars?新课讲解4Listen and sing along.What

12、 Is Science?What is science?Can you explain?Please make it easy for my brain.Its about making observations.Why do onions make me cry?Why do clouds go by?What keeps the birds in the sky?Thats just science.新课讲解Its about matterthe universe.Why does a car stay on the road?Why is there green all over a t

13、oad?Why cant I carry a heavy load?Thats just science. 新课讲解 experiment /kspermnt/ n.实验；试验 PointLanguage point 1“做实验”可用do/make/carry out an experiment表达。eg：Mr. Black is doing/making/carrying out an experiment in physics. 布莱克先生正在做一个物理实验。experiment v.做试验，进行实验，常和介词on，with连用。eg：He is experimenting on frog

14、s. 他正在青蛙身上做试验。 新课讲解 turnupside down 把翻转；倒过来 PointLanguage points 2反义短语为：turn.right side up 把正面朝上。eg：Turn the box right side up, please. 请把这个盒子正面朝上放。eg：Can you turn the glass upside down? 你能把这个玻璃杯倒过来吗？新课讲解 takeoff 把从拿开 PointLanguage points 3take off 脱掉，摘掉，(飞机)起飞eg：Bill took off his glasses. 比尔摘掉了他的眼镜

15、。 The plane will take off at 2：00 p.m. 飞机将在下午两点起飞。 Please take your hand off the food. 请把你的手从食物上拿开。新课讲解 get /et/v.收到；(使)达到；变得 PointLanguage points 4get作系动词，表示“变得”，后跟形容词作表语。eg：The weather will get cool when autumn es. 当秋天到来的时候，天气会变得凉爽。新课讲解Thats called那被叫做 PointLanguage points 5此句是一般现在时的被动语态，That在这句话中

16、充当主语，is called 构成被动语态结构。一般现在时的被动语态的构成为：be动词(am/is/are)动词的过去分词。eg：More money is saved by using both sides of paper. 通过使用纸的两面，更多的钱被节省下来了。新课讲解典例Claudia, are you going to Jeffs birthday party on Saturday?Unless I_ (湖北黄冈)A. will be invited B. am invitedC. was inviting D. invited【点拨】考查被动语态和时态。句意：克劳迪娅，周六你打

17、算去杰夫的生日聚会吗？除非我被邀请。unless引导条件状语从句，当主句(此处已省略)描述将来发生的动作时，从句中用一般现在时表示将来的动作。 B新课讲解be sure of 确信 PointLanguage points 6be sure to do sth. 一定会做某事(一般指局外人的推测，主语可以是人，也可以是物) He is sure to win. 他一定会赢。 新课讲解be sure that从句 确信 He is sure that he can succeed.他确信他能成功。 make sure that从句 查明，弄清 She looked around to make

18、sure that she was alone.她往四下里看看，是不是只有她一个人。 for sure 无疑，肯定 He will be here for sure within an hour.他一小时之内肯定到这儿。 新课讲解辨析 above，over与on PointLanguage points 7above 只是笼统地表示“高于，在上方”，其反义词为below。 We were flying above the clouds.我们在云层上面飞行。 over 表示在某物体的正上方，与某物体垂直但不接触，其反义词为under。 There is a bridge over the riv

19、er.河上有座桥。on 表示在某物体的表面之上，与某物体表面接触。 He laid a hand on my shoulder.他把一只手放在我的肩上。 新课讲解当堂小练一、根据句意及首字母或汉语提示补全单词1Its the best _ of working out the math problem.2Im sure that the _ of the air will keep the water in the jar.3Can you help me _ the mistake that you find?4Put on the_ (雨衣)for its raining heavily.5Dont turn the cup _ (上部)down.ethod orce orrect raincoat upside 当堂小练二、单项选择6Tom is covering the cup _ a p