1、 Unit 5Lets Do an Experiment!Lesson 25 课文课文呈现呈现知识知识讲解讲解Lesson 25 Lets Do an Experiment!课课堂堂导导入入课课文文1 1课课堂堂小小结结课课后后作作业业词词汇汇听听写写课课堂堂练练习习 同学们，上一课学习的单词你们都掌握了吗？现在同学们，上一课学习的单词你们都掌握了吗？现在大家来检验一下，点击下面的音频开始听写吧！大家来检验一下，点击下面的音频开始听写吧！Do you like doing experiments?Why?THINK ABOUT ITWhat kinds of experiments have
2、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 cardboard and hold it there.Then I turn the jar upside down and take my hand off
3、 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 think the water will pour out，Danny.I think the water will stay in the jar.Lets test which the
4、ory is correct.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!Brian：Are you ready，Danny?Danny：No!Wait!(He puts ona raincoat and sits down.)Now I think Im ready
5、.Jenny：Brian，take your hand off the cardboard.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 possible?Brian：The force of the air keeps the water in the jar.It is strong enough to hold the water.Danny：Wo
6、w!Brian：So what have we discovered？1011Jenny：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 that air is stronger than I thought.experiment/k spermnt/n实实验；验；试验试验 eg：Many people are against doing experiment
7、s on animals.许多人不赞成在动物身上做实验。知识点知识点1 1考向一考向一“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 frogs.他正在青蛙身上做试验。考向二考向二 turnupside down 把翻转；倒过来 考向考向反义短语为：turn.right side
8、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。知识点知识点2 2eg：Can you turn the glass upside down?你能把这个玻璃杯倒过来吗？takeoff 把从拿开 拓展拓展take off 脱掉，摘掉，脱掉，摘掉，(飞机飞机)起飞起飞eg：Bill took off his glasses.比尔摘掉了他的眼镜。The plane will take off at 2：00 pm.飞机将在下午两点起飞。知识点知识点3 3eg：Please take your hand off the food.请把
9、你的手从食物上拿开。典例典例 He _ my wet coat and made me sit by the fire.Awent by Bran out Ctook off Dturned up【点拨点拨】考查动词短语辨析。采用考查动词短语辨析。采用逻辑推理法逻辑推理法。go by(时时 间间)流逝；流逝；run out用完；用完；take off脱掉，脱掉，(飞机飞机)起飞；起飞；turn up调高调高(音量音量)，出现。句意为：他脱掉我湿漉漉的外，出现。句意为：他脱掉我湿漉漉的外 套，让我在火炉旁坐下。故选套，让我在火炉旁坐下。故选C。C get/et/v.收到；收到；(使使)达到；变得
10、达到；变得 考向一考向一知识点知识点4 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 comes.当秋天到来的时候，天气会变得凉爽。考向二考向二get相关的短语：相关的短语：get along/on with与和睦相处get away 离开，走开get back 返回get down 下来，写下get on 上车get off 下车get together 会面，聚集典例典例We should think more of others if we want to _them.(重庆A)A.get on wel
11、l with B.hear ofC.get ready for D.hear from【点拨点拨】考查动词短语辨析。采用考查动词短语辨析。采用逻辑推理法逻辑推理法。get on well with 和和相处得很融洽；相处得很融洽；hear of 听说；听说；get ready for 为为做准备；做准备；hear from 收到收到的来信。句意：的来信。句意：如果我们想和其他人相处得很融洽，我们就应该多为他们如果我们想和其他人相处得很融洽，我们就应该多为他们着想。结合语境，可知选着想。结合语境，可知选A。AThats called那被叫做那被叫做 考向考向知识点知识点5 5此句是一般现在时的被
12、动语态，That在这句话中充当主语，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。典例典例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【点拨点拨】考查被动语态和时态。句意：考查
13、被动语态和时态。句意：克劳迪娅，周克劳迪娅，周六你打算去杰夫的生日聚会吗？六你打算去杰夫的生日聚会吗？除非我被邀请。除非我被邀请。unless引导条件状语从句，当主句引导条件状语从句，当主句(此处已省略此处已省略)描述将来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。发生的动作时，从句中用一般现在时表示将来的动作。Bscientific/santfk/adj.科学的科学的 考向考向知识点知识点6 6eg：This is a scientific instrument.这是一件科学仪器。scientific还表示还表示“细致严谨的细致严谨的”。eg：We need to be more
14、 scientific about this problem.在这个问题上我们需要更为严谨一些。be sure of 确信确信 考向考向知识点知识点7 7eg：I am sure of what he said.我确信他所 说的。与与sure有关的结构有关的结构 be 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。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 aroun
15、d to make 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。典例典例It is sure _ tomorrow morning.ArainBto rainCraining Dto be rained【点拨点拨】考查考查be sure to do sth.“一定一定/必然会做某事必然会做某事”。句。句 意：明天早上肯定会下雨。故选意：明天早上肯定会下雨。故选B。Bover/v(r)/prep.在在上方，穿越上方，穿越考向
16、考向知识点知识点8 8eg：There was a lamp hanging over the table.有一盏灯吊在桌子上方。【易错点易错点】辨析辨析 above，over与与on above 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 river.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
17、把一只手放在我的肩上。put on 穿上；戴上；上演穿上；戴上；上演 知识点知识点9 9eg：He puts on his best clothes for the party.为了聚会他穿上了他最好的衣服。The play had been planned to put on today，but it was put off because of the bad weather.这部戏剧计划今天上演，但是因为坏天 气推迟了。考向考向与与put有关的短语：有关的短语：put up 挂上，张贴，建立，举起 Its time we put up the Christmas decorations
18、in the living room.我们该在起居室里挂上圣诞装饰品了。One minute later，a boy put up his hand.一分钟后，一个男孩举起了手。put away 把收起，储存 The fruit should be carefully put away.水果应小心存放起来。Please put your books away.请把你的书收起来。put out 熄灭，扔掉 They managed to put out the fire.他们设法把火扑灭了。put off 推迟，延迟 Why dont you put off the meeting？你们为什么不
19、推迟会议？典例典例The little child _ the toys and went for dinner.(浙江嘉兴)Aput on Bput upCput off Dput away【点拨点拨】put on穿上；穿上；put up张贴；张贴；put off推迟；推迟；put away 把把收起。根据句意收起。根据句意“这个小孩把玩具收起来去吃晚这个小孩把玩具收起来去吃晚 饭。饭。”可知选可知选D。D force/fs/n力量力量 v迫使迫使；强迫强迫 知识点知识点1010eg：the force of nature 大自然的力量force作动词时，常用的句式为：作动词时，常用的句式为
20、：force sb.to do sth.force sb.into doing sth.意为意为“强迫某强迫某人做某事人做某事”。eg：They forced him to leave his country.他们强迫他离开了他的国家。考向考向 discover/dskv(r)/v发现，发觉发现，发觉 考向考向知识点知识点eg：Who discovered Hawaii?谁发现了夏威夷？辨析辨析 find，discover与与invent find 找到，侧重于找到过去丢失的人或物，但有时也表示凭经验或偶然发现了一种东西。I cant find my English book.我找不到我的英语
21、书了。1111discover 指“发现，找到”本已存在，但尚未被人类发现或认识的事物。Columbus discovered America in 1492.哥伦布于1492年发现了美洲。invent 指“发明，创造”出世界上本来不存在的东西。如工具、方法、手段等。Mr.Smith invented a new teaching method.史密斯先生发明了一种新的教学方法。用图片表示为：discover 发现invent 发明1.Read the lesson and answer the questions.1Where does Danny think they should do
22、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?Outside.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
23、get wet.He concludes that air is stronger than he thought.Lets Do It!Lets Do It!2.Read the experiment.Put the sentences in the correct order.Put a piece of cardboard over 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
24、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 happens?There is more air outside the jar than inside，so there is more air pressure outside than inside.251346Lets Do It!Lets Do It!3.Try
25、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?Lets Do It!Lets Do It!4.Listen and sing along.What Is Science?What is science?Can you explain?Please make it easy for my brain.Its about making ob
26、servations .Why do onions make me cry?Why do clouds go by?What keeps the birds in the sky?Thats just science.12Lets Do It!Lets Do It!Its about matterthe universe.Why does a car stay on the road?Why is there green all over a toad?Why cant I carry a heavy load?Thats just science.Lets Do It!Lets Do It!
27、make observations 观察观察知识点知识点eg：While doing experiments，you must make careful observations.做实验时，你必须仔细观察。make observations还可意为还可意为“作评论作评论”。eg：Mr.Wang made some useful observations on the Internet.王老师在网上作了一些有用的评论。考向考向12 本节课主要学习了以下重点内容本节课主要学习了以下重点内容:（1 1）重点单词：）重点单词：experiment，get,scientific,over,force,d
28、iscover等。等。（2 2）重点短语：）重点短语：upside down，take off，be sure of,put on等。等。（3 3）重点句式：）重点句式：thats called一、根据句意及首字母或汉语提示补全单词一、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 th
29、e_(雨衣)for its raining heavily.5Dont turn the cup _(上部)down.method cf orce orrect raincoat upside 二、单项选择二、单项选择6Tom is covering the cup _ a piece of paper.Afor Bon Cwith Din 7I wont force anybody _ anything.Ado Bdoes Cto do DDoing8(中考成都)Mum wants to watch CCTV news.Lets_ the TV.Aturn downBturn onCturn
30、 offCCB9He _ my wet boots and made me _by the fire.Atook off;sitting Btook off;sit Cput off;sit Dput off;sitting10(中考成都)Excuse me,do you know_？About five minutes walk.Awhere the hospital is Bhow far the hospital is Chow I can get to the hospitalBB三、连词成句三、连词成句(注意词形变化注意词形变化)11got，the，boy，rainy，in，wet，
31、the(.)_ 12red，with，the，is，basket，apples，fill，big(.)_ 13his，brother，covered，hands，face，with，his，my(.)_14five，am，she，sure，minutes，come，in，will，I(.)_15(中考上海)doing,the students,in the lab,an experiment,are(.)_The boy got wet in the rain.The basket is filled with big red apples.My brother covered his face with his hands.I am sure she will come in five minutes.The students are doing an experiment in the lab.1.熟记本课时的词汇熟记本课时的词汇 2.完成本课时的课后作业完成本课时的课后作业课后作业课后作业
