Unit 5 Look into Science Lesson 25 Let's Do an Experiment!课件(共37张PPT)

(共37张PPT)
Lesson 25
Unit 5
Look into Science
掌握本课新单词: science, experiment, fill, prove, scientific, method.
掌握本课短语: do an experiment, fill…with, cover…with, turn…upside down, be (not) sure…
增强对科学实验的兴趣
学习目标
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！
Dictation
Do you like doing experiments Why
Lead in
THINK ABOUT IT
·What kinds of experiments have you done in science class
·If you hold a jar that is filled with water upside down，what will happen
Text presentation
新课讲授
Brian：Let’s 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 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 don’t think so.
Jenny：You think the water will pour out，Danny. I think the water will stay in the jar. Let’s test which theory is correct.
Danny，Jenny and Brian are in the lab.
Brian：Good idea，Jenny. That’s 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 won’t get wet.
Danny：Well，let’s try it!
Brian：Are you ready，Danny
Danny：No! Wait! (He puts on a raincoat and sits down.) Now I think I’m ready.
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：Wow!
Brian：So what have we discovered ？
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 that air is stronger than I thought.
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1. Read the lesson and answer the questions.
1) Where does Danny think they should do the experiment
2) What keeps the water in the jar
3) Is Jenny sure of her theory？How do you know
4) Why does Danny put on his raincoat
5) What does Danny conclude
Outside.　
The force of air.
Yes, she is. She asks Brian to do the experiment over Danny’s head and she knows he won’t get wet.
He is afraid that he will get wet.
He concludes that air is stronger than he thought.
Let's 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 in the 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 happens
□There is more air outside the jar than inside，so there is more air pressure outside than inside.
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5
1
3
4
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3. Try 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
4. Listen and sing along.
What Is Science
What is science
Can you explain
Please make it easy for my brain.
It’s about making observations .
Why do onions make me cry
Why do clouds go by
What keeps the birds in the sky
That’s just science.
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It’s about matter—the universe.
Why does a car stay on the road
Why is there green all over a toad
Why can’t I carry a heavy load
That’s just science.
experiment / k'sper m nt/ n.实验；试验
eg：Many people are against doing experiments on animals. 许多人不赞成在动物身上做实验。
知识点
1
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。
Language points
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
turn…upside down 把……翻转；倒过来
考向
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。
知识点
2
eg：Can you turn the glass upside down
你能把这个玻璃杯倒过来吗？
take…off… 把……从……拿开
拓展
take off 脱掉，摘掉，(飞机)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 p．m.
飞机将在下午两点起飞。
知识点
3
eg：Please take your hand off the food.
请把你的手从食物上拿开。
典例
He ________ my wet coat and made me sit by the fire.
A．went by　　　　　 B．ran out
C．took off D．turned up
【点拨】考查动词短语辨析。采用逻辑推理法。go by(时间)流逝；run out用完；take off脱掉，(飞机)起飞；turn up调高(音量)，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C。
C
get /ɡet/v.收到；(使)达到；变得
考向一
知识点
4
get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
get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 together 会面，聚集
get on 上车　 get off 下车
典例
We should think more of others if we want to ________ them.(重庆A)
A. get on well with　　　 B. hear of
C. get ready for D. hear from
【点拨】考查动词短语辨析。采用逻辑推理法。get on well with 和……相处得很融洽；hear of 听说；get ready for 为……做准备；hear from 收到……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着想。结合语境，可知选A。
A
That’s called…那被叫做……
考向
知识点
5
此句是一般现在时的被动语态，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
—Claudia, are you going to Jeff's birthday party on Saturday
—Unless I________． (湖北黄冈)
A. will be invited　　 　B. am invited
C. 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
scientific/ sa n't f k/adj.科学的
考向
知识点
6
eg：This is a scientific instrument.
这是一件科学仪器。
scientific还表示“细致严谨的”。
eg：We need to be more 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
考向
知识点
7
eg：I am sure of what he said. 我确信他所说的。
与sure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 around 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
It is sure ________ tomorrow morning.
A．rain　　　　B．to rain
C．raining D．to be rained
【点拨】考查be sure to do sth.“一定/必然会做某事”。句意：明天早上肯定会下雨。故选B。
B
over/' v (r)/ prep.在……上方，穿越
知识点
8
eg：There was a lamp hanging over the table.
有一盏灯吊在桌子上方。
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.
他把一只手放在我的肩上。
考向【易错点】
辨析 above，over与on
put on 穿上；戴上；上演
知识点
9
eg：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。
put up 挂上，张贴，建立，举起 It’s time we put up the Christmas decorations 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 don’t you put off the meeting？
你们为什么不推迟会议？
考向
与put有关的短语：
典例
The little child ________ the toys and went for dinner. (浙江嘉兴)
A．put on　 　　B．put up
C．put off D．put away
【点拨】put on穿上；put up张贴；put off推迟；put away把……收起。根据句意“这个小孩把玩具收起来去吃晚饭。”可知选D。
D
force/f s/ n.力量 v.迫使；强迫
知识点
10
eg：the force of nature 大自然的力量
force作动词时，常用的句式为：force sb.to do sth.＝force sb.into doing sth.意为“强迫某人做某事”。
eg：They forced him to leave his country.
他们强迫他离开了他的国家。
考向
discover/d 'sk v (r)/ v.发现，发觉
考向
知识点
eg：Who discovered Hawaii 谁发现了夏威夷？
辨析 find，discover与invent
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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 can’t find my English book.
我找不到我的英语书了。
discover 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
make observations 观察
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“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
12
本节课主要学习了以下重点内容:
（1）重点单词：experiment，get, scientific, over, force, discover等。
（2）重点短语：upside down，take off，be sure of , put on等。
（3）重点句式：That’s called…
课堂总结
一、根据句意及首字母或汉语提示补全单词
1．It’s the best m________ of working out the math problem.
2．I’m sure that the f________ of the air will keep the water in the jar.
3．Can you help me c________ the mistake that you find
4．Put on the________ (雨衣)for it's raining heavily.
5．Don't turn the cup ________ (上部)down.
ethod　
orce
orrect
raincoat　
upside
当堂检测
二、单项选择
6．Tom is covering the cup ________ a piece of paper.
A．for B．on C．with D．in
7．I won’t force anybody ________ anything.
A．do B．does C．to do D．Doing
8．(中考·成都)Mum wants to watch CCTV news. Let’s
________ the TV.
A．turn down　　 B．turn on　　 C．turn off
C
C
B
9．He ________ my wet boots and made me ________
by the fire.
A．took off; sitting B．took off; sit
C．put off; sit D．put off; sitting
10．(中考·成都) —Excuse me, do you know________？
—About five minutes’ walk.
A．where the hospital is
B．how far the hospital is
C．how I can get to the hospital
B
B
三、连词成句(注意词形变化)
11．got，the，boy，rainy，in，wet，the(.)
_________________________________________
12．red，with，the，is，basket，apples，fill，big(.)
_____________________________________________
13．his，brother，covered，hands，face，with，his，my(.)
_____________________________________________
14．five，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.