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初中英语冀教版九年级上册Lesson 25 Let’s Do an Experiment!备课ppt课件
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这是一份初中英语冀教版九年级上册Lesson 25 Let’s Do an Experiment!备课ppt课件，文件包含Lesson25Let’sDoanExperimentpptx、Lesson25词汇听写wav、Lesson25课文朗读wav、LetsDoIt4wav等4份课件配套教学资源，其中PPT共27页， 欢迎下载使用。
1 学习目标 2 新课导入3 新课讲解 4 当堂小练5 课堂小结 6 课后作业7
Curriculum wrds: pur, crrect, scientific, methd, raincat, frce, pressure Useful expressins: I cver the tp with a piece f cardbard and hld it there.I am s sure f my thery that Brian can d the experiment ver yur head and I knw yu wn’t get wet.Functins: Master the new wrds: experiment, jar, upside, pur, crrect, scientific, methd, raincat, frce, pressure, cnclude Grammar: be动词(am/is/are)＋动词的过去分词Sentences: The frce f the air keeps the water in the jar. It is strng enugh t hld the water.
D yu like ding experiments ? Why?
THINK ABOUT IT
·What kinds f experiments have yu dne in science class?·If yu hld a jar that is filled with water upside dwn，what will happen? Danny，Jenny and Brian are in the lab.
Brian：Let’s d an experiment. I fill a jar with water. I cver the tp with a piece f cardbard and hld it there. Then I turn the jar upside dwn
and take my hand ff the cardbard. Can yu guess what will happen?Danny：I think the flr will get wet. We shuld d this experiment utside，Brian.Jenny：I think the cardbard will hld the water.Danny：I dn’t think s.Jenny：Yu think the water will pur ut，Danny. I think the water will stay in the jar. Let’s test which thery is crrect.
Brian：Gd idea，Jenny. That’s called the scientific methd.Jenny：I am s sure f my thery that Brian can d the experiment ver yur head and I knw yu wn’t get wet.Danny：Well，let’s try it!Brian：Are yu ready，Danny?Danny：N! Wait! (He puts n a raincat and sits dwn.) Nw I think I’m ready.Jenny：Brian，take yur hand ff the cardbard.
Danny：N! (Danny clses his eyes tightly，and Brian takes his hand ff the cardbard. The water stays in the jar.)Jenny：See，Danny!Danny：Hw is that pssible?Brian：The frce f the air keeps the water in the jar. It is strng enugh t hld the water.Danny：Ww!Brian：S what have we discvered？
Jenny：We have discvered that the air pressure helps the cardbard hld the water in the jar.Brian：Right. What d yu cnclude，Danny?Danny：I cnclude that air is strnger than I thught.
Let ′s D It !
Read the lessn and answer the questins.
1．Where des Danny think they shuld d the experiment? 2．What keeps the water in the jar? 3．Is Jenny sure f her thery？Hw d yu knw? 4．Why des Danny put n his raincat? 5．What des Danny cnclude?
Outside.
The frce f air.
Yes, she is. She asks Brian t d the experiment ver Danny’s head and she knws he wn’t get wet.
He is afraid that he will get wet.
He cncludes that air is strnger than he thught.
Read the experiment. Put the sentences in the crrect rder.
□Put a piece f cardbard ver the jar.□The jar f water is upside dwn，but the water stays inthe jar. This is because air pressure pushes the cardbard nt the jar.□Fill the glass jar with water.□Turn the glass jar ver quickly. Hld yur hand n the cardbard fr a few secnds.□Remve yur hand frm underneath the jar. What happens?□There is mre air utside the jar than inside，s there is mre air pressure utside than inside.
Try t d the experiment in this lessn yurself.
Task tips：What happens when yu use less water， mre water，wet cardbard，r different kinds and sizes f jars?
Listen and sing alng.
What Is Science?What is science?Can yu explain?Please make it easy fr my brain.It’s abut making bservatins.Why d nins make me cry?Why d cluds g by?What keeps the birds in the sky?That’s just science.
It’s abut matter—the universe.Why des a car stay n the rad?Why is there green all ver a tad?Why can’t I carry a heavy lad?That’s just science.
experiment /ɪk'sperɪmənt/ n.实验；试验
Language pint 1
“做实验”可用d/make/carry ut an experiment表达。eg：Mr. Black is ding/making/carrying ut 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n，with连用。eg：He is experimenting n frgs. 他正在青蛙身上做试验。
turn…upside dwn 把……翻转；倒过来
Language pints 2
反义短语为： side up 把……正面朝上。eg：Turn the bx right side up, please. 请把这个盒子正面朝上放。eg：Can yu turn the glass upside dwn? 你能把这个玻璃杯倒过来吗？
take…ff… 把……从……拿开
Language pints 3
take ff 脱掉，摘掉，(飞机)起飞eg：Bill tk ff his glasses. 比尔摘掉了他的眼镜。 The plane will take ff at 2：00 p.m. 飞机将在下午两点起飞。 Please take yur hand ff the fd. 请把你的手从食物上拿开。
get /ɡet/v.收到；(使)达到；变得
Language pints 4
get作系动词，表示“变得”，后跟形容词作表语。eg：The weather will get cl when autumn cmes. 当秋天到来的时候，天气会变得凉爽。
That’s called…那被叫做……
Language pints 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：Mre mney is saved by using bth sides f paper. 通过使用纸的两面，更多的钱被节省下来了。
—Claudia, are yu ging t Jeff's birthday party n 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。
be sure f 确信
Language pints 6
辨析 abve，ver与n
Language pints 7
一、根据句意及首字母或汉语提示补全单词
1．It’s the best ________ f wrking ut the math prblem.2．I’m sure that the ________ f the air will keep the water in the jar.3．Can yu help me ________ the mistake that yu find?4．Put n the________ (雨衣)fr it's raining heavily.5．Dn't turn the cup ________ (上部)dwn.
6．Tm is cvering the cup ________ a piece f paper. A．fr B．n C．with D．in 7．I wn’t frce anybdy ________ anything. A．d B．des C．t d D．Ding8．(中考·成都)Mum wants t watch CCTV news. Let’s________ the TV. A．turn dwn B．turn n C．turn ff
1 学习目标 2 新课导入3 新课讲解 4 当堂小练5 课堂小结 6 课后作业7
Curriculum wrds: pur, crrect, scientific, methd, raincat, frce, pressure Useful expressins: I cver the tp with a piece f cardbard and hld it there.I am s sure f my thery that Brian can d the experiment ver yur head and I knw yu wn’t get wet.Functins: Master the new wrds: experiment, jar, upside, pur, crrect, scientific, methd, raincat, frce, pressure, cnclude Grammar: be动词(am/is/are)＋动词的过去分词Sentences: The frce f the air keeps the water in the jar. It is strng enugh t hld the water.
D yu like ding experiments ? Why?
THINK ABOUT IT
·What kinds f experiments have yu dne in science class?·If yu hld a jar that is filled with water upside dwn，what will happen? Danny，Jenny and Brian are in the lab.
Brian：Let’s d an experiment. I fill a jar with water. I cver the tp with a piece f cardbard and hld it there. Then I turn the jar upside dwn
and take my hand ff the cardbard. Can yu guess what will happen?Danny：I think the flr will get wet. We shuld d this experiment utside，Brian.Jenny：I think the cardbard will hld the water.Danny：I dn’t think s.Jenny：Yu think the water will pur ut，Danny. I think the water will stay in the jar. Let’s test which thery is crrect.
Brian：Gd idea，Jenny. That’s called the scientific methd.Jenny：I am s sure f my thery that Brian can d the experiment ver yur head and I knw yu wn’t get wet.Danny：Well，let’s try it!Brian：Are yu ready，Danny?Danny：N! Wait! (He puts n a raincat and sits dwn.) Nw I think I’m ready.Jenny：Brian，take yur hand ff the cardbard.
Danny：N! (Danny clses his eyes tightly，and Brian takes his hand ff the cardbard. The water stays in the jar.)Jenny：See，Danny!Danny：Hw is that pssible?Brian：The frce f the air keeps the water in the jar. It is strng enugh t hld the water.Danny：Ww!Brian：S what have we discvered？
Jenny：We have discvered that the air pressure helps the cardbard hld the water in the jar.Brian：Right. What d yu cnclude，Danny?Danny：I cnclude that air is strnger than I thught.
Let ′s D It !
Read the lessn and answer the questins.
1．Where des Danny think they shuld d the experiment? 2．What keeps the water in the jar? 3．Is Jenny sure f her thery？Hw d yu knw? 4．Why des Danny put n his raincat? 5．What des Danny cnclude?
Outside.
The frce f air.
Yes, she is. She asks Brian t d the experiment ver Danny’s head and she knws he wn’t get wet.
He is afraid that he will get wet.
He cncludes that air is strnger than he thught.
Read the experiment. Put the sentences in the crrect rder.
□Put a piece f cardbard ver the jar.□The jar f water is upside dwn，but the water stays inthe jar. This is because air pressure pushes the cardbard nt the jar.□Fill the glass jar with water.□Turn the glass jar ver quickly. Hld yur hand n the cardbard fr a few secnds.□Remve yur hand frm underneath the jar. What happens?□There is mre air utside the jar than inside，s there is mre air pressure utside than inside.
Try t d the experiment in this lessn yurself.
Task tips：What happens when yu use less water， mre water，wet cardbard，r different kinds and sizes f jars?
Listen and sing alng.
What Is Science?What is science?Can yu explain?Please make it easy fr my brain.It’s abut making bservatins.Why d nins make me cry?Why d cluds g by?What keeps the birds in the sky?That’s just science.
It’s abut matter—the universe.Why des a car stay n the rad?Why is there green all ver a tad?Why can’t I carry a heavy lad?That’s just science.
experiment /ɪk'sperɪmənt/ n.实验；试验
Language pint 1
“做实验”可用d/make/carry ut an experiment表达。eg：Mr. Black is ding/making/carrying ut 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n，with连用。eg：He is experimenting n frgs. 他正在青蛙身上做试验。
turn…upside dwn 把……翻转；倒过来
Language pints 2
反义短语为： side up 把……正面朝上。eg：Turn the bx right side up, please. 请把这个盒子正面朝上放。eg：Can yu turn the glass upside dwn? 你能把这个玻璃杯倒过来吗？
take…ff… 把……从……拿开
Language pints 3
take ff 脱掉，摘掉，(飞机)起飞eg：Bill tk ff his glasses. 比尔摘掉了他的眼镜。 The plane will take ff at 2：00 p.m. 飞机将在下午两点起飞。 Please take yur hand ff the fd. 请把你的手从食物上拿开。
get /ɡet/v.收到；(使)达到；变得
Language pints 4
get作系动词，表示“变得”，后跟形容词作表语。eg：The weather will get cl when autumn cmes. 当秋天到来的时候，天气会变得凉爽。
That’s called…那被叫做……
Language pints 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：Mre mney is saved by using bth sides f paper. 通过使用纸的两面，更多的钱被节省下来了。
—Claudia, are yu ging t Jeff's birthday party n 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。
be sure f 确信
Language pints 6
辨析 abve，ver与n
Language pints 7
一、根据句意及首字母或汉语提示补全单词
1．It’s the best ________ f wrking ut the math prblem.2．I’m sure that the ________ f the air will keep the water in the jar.3．Can yu help me ________ the mistake that yu find?4．Put n the________ (雨衣)fr it's raining heavily.5．Dn't turn the cup ________ (上部)dwn.
6．Tm is cvering the cup ________ a piece f paper. A．fr B．n C．with D．in 7．I wn’t frce anybdy ________ anything. A．d B．des C．t d D．Ding8．(中考·成都)Mum wants t watch CCTV news. Let’s________ the TV. A．turn dwn B．turn n C．turn ff
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