英语九年级上册Lesson 25 Let’s Do an Experiment!课文ppt课件

这是一份英语九年级上册Lesson 25 Let’s Do an Experiment!课文ppt课件，共22页。PPT课件主要包含了Objectives等内容，欢迎下载使用。
The new wrds: experiment, jar, upside, pur, crrect, scientific, methd, raincat, frce, pressure, cncludeT understand the thery f the experiment.T learn actively.
experimentjarupsidepurcrrectscientific
n. 实验；试验n. 广口瓶；罐子n. 上部；上边v. 倒出；倾倒adj. 正确的；恰当的adj. 科学的
methdraincatfrcepressurecnclude
n. 方法；办法n. 雨衣n. 力量 v. 迫使；强迫n. 压力；压强；挤压v. 得出结论；推断出
Free talk
What is science?D yu like t d experiments?
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 ❶ water. I cver the tp with a piece f cardbard and hld it there.
Presentatin
Then I turn the jar upside dwn ❷ and take my hand ff ❸ 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 ❹, 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 ❺.Jenny：I am s sure f ❻ 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.
I fill a jar with water. 我用水把瓶子装满。 fill …with…用…装满…… He has filled his case with many bks. 他已经把书装满了箱子。
2. I turn the jar upside dwn. 我把广口瓶倒置。
upside dwn “向下翻转过来” turn ... upside dwn “把翻转”“倒过来”right side up “正面朝上”
3. take…ff… 把……拿开
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。
eg：Please take yur hand ff the fd. 请把你的手从食物上拿开。
He ________ my wet cat and made me sit by the fire. A．went by　　　　　 B．ran ut C．tk ff D．turned up
【点拨】考查动词短语辨析。采用逻辑推理法。 g by (时间)流逝； run ut 用完； take ff 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。
4. Yu think the water will pur ut, Danny. 你认为水会涌出来，丹尼。
pur v. “倒出；倾倒”
pur ut “涌出”“倾诉；诉说”
eg：Water pured ut f the tap. 水从水龙头涌出。 She pured ut her trubles t me. 她向我倾诉了她的苦恼。
5. That’s called the scientific methd. 那被称为科学方法。
That’s called... “那被称作”
scientific methd “科学方法”
eg：I am sure f what he said. 我确信他所说的。
6. I am s sure f my thery. 我对我的理论很有把握。
be sure f “确信”
be sure t d sth. “务必做某事”
□Put a piece f cardbard ver the jar.□The jar f water is upside dwn, but the water stays in the 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.
Let's D It !
□Put a piece f cardbard ver the jar.□The jar f water is upside dwn，but the water stays in the 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.
experimentjar upsidepur crrectscientific methdraincat frcepressure cnclude
What did we learn?
fill ... ... upside dwntake ... ffpur utscientific methdbe sure f
1. He ________ my wet cat and made me sit by the fire. A．went by　　　　　 B．ran ut C．tk ff D．turned up2. It is sure ________ tmrrw mrning. A．rain　　　　B．t rain C．raining D．t be rained3. We did ____ experiment in physics class. A．a B．an C．any D．/