英语冀教版Lesson 25 Let’s Do an Experiment!图文课件ppt

这是一份英语冀教版Lesson 25 Let’s Do an Experiment!图文课件ppt，共41页。PPT课件主要包含了objectives，Discuss ，Lesson 26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
D yu like t d experiments?What experiments have yu dne?
Listen and answer the fllwing questins.
1.What’s Danny’s thery? 2.What’s Jenny’s thery?
Danny thinks the flr will get wet.
Jenny thinks the water will stay in the jar.
Pre-reading
While-reading
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?
He thinks they shuld d it utside.
The frce f the air.
Yes, she is. She thinks that Brian can d the experiment ver Danny’s head.
4. Why des Danny put n his raincat? 5. What des Danny cnclude?
He thinks the water will pur ut.
The air is strnger than he 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。 cver…with… 用……盖住……
2. I turn the jar upside dwn. 我把广口瓶倒置。
upside dwn “向下翻转过来”。 Yu hld the bk upside dwn. 你把书拿倒了。right side up “正面朝上”
be sure +that 从句表示“认为…一定…” 而be nt sure 表示不确定.
eg. I’m sure she will cme here. 我确信她会来。 I’m nt sure when he’ll cme here. 我不能肯定什么时候来这儿。
I’m sure the flr wn’t get wet. 我确信地板不会湿。
4. We’ll d the experiment and bserved what will happen. 我们将做这个实验并观察会发生什么情况。 bserved 动词, “观察”。 bserve sb. d/ ding sth. eg. I bserved her dance. When I passed by the grass, I bserved him walking.
Fill in the blank with the prper wrd. The first letter is given.
1. Let’s d the e and see what happens.2. A “t ” is an idea and predicts what will happen.3. We can p wh’s right.4. Turn the jar u dwn and we can see what will happen.5. “O ” is anther way f saying “watch carefully”.
Let’s d an interesting experiment. First, I ____ a jar _____a desk, ____it _____ water, then _____the tp ____ a piece f cardbard. When I ____the jar ______ _______, can yu guess what will happen?
Hw d we d the experiment?
Pst-reading
Let’s D It !
In a small grup, try the experiment abve. Try it with the jar full. Try it again with the jar nearly empty. Write dwn yur bservatins. Did the experiment wrk? Did anyne get wet?
A balln is full f air. If we pierce(刺破) it with a needle, it will break with a lud bang. But if we put a piece f glue n the balln and d the same experiment, what will happen? Surprisingly, we wn’t hear the same sund. The balln will becme smaller and smaller. We will feel that the air is running ut slwly thrugh the pinhle(针孔). We knw the balln is made f
An Experiment abut a Balln
rubber(橡胶). When the balln is pierced, the airleaving the balln frms a kind f frce. Rubber iss thin that it can’t supprt(支撑) such frce. Sthe balln breaks quickly with a lud bang. Butthe glue is different. It’s strng enugh t supprt the frce f the air. Peple have learned smething frm this experiment. They have used this methd t make tires(轮胎).
I. 根据汉语或首字母提示，完成下列句子。
1. It is the best ________ (方法) f wrking ut the math prblem.2. Have yu heard f the ________ (理论）befre?3. My daughter likes _________ (科学) mre than English.4. Yur answer is wrng, and we can d an experiment t p_____ it.5. Dn’t turn the bttle u______ dwn. It’s t dangerus.
1. He lcked the dr ________ (careful) befre he left.2. Let’s ______ (finish) the wrk tgether nw.3. Can yu guess what __________ (happen) in 100 years?4. What's anther way f _______ (say) “autumn”?
II. 用所给单词的适当形式填空。
will happen
1. 我确信你是一个诚实的人。I ______ ______ that yu are an hnest man.2. 请用一块玻璃盖上那个杯子。Please ______ the cup _____ a piece f glass.3. 小心，否则你会弄湿的。Be careful, r yu’ll ______ ______.4. 把箱子倒过来，你会找到标签的。______ the bx _______ _______, then yu’ll find the label.
III. 根据所给汉语意思翻译下列句子。
am sure
cver with
get wet
Turn upside dwn
hlder n. 支托物candle hlder n. 蜡烛座shallw adj. 浅的light v. 点燃lighter n. 打火机；点火器match n. 火柴burn v. 燃烧examine v. 检查xygen n. 氧气use up 用完
candle hlder n.
Think abut it
D yu think science is interesting? Why r why nt?Name ne r tw famus Chinese scientist. What d yu knw abut them?
Science is s interesting! I’m sure yu’ll like this experiment!
What d yu need?
A candleA candle hlderA big glass jar A shallw dish with watermatches
What d yu d?
1. Put the candle in the candle hlder.2. Put the candle hlder n the dish.3. Fill the dish half full f water.4. Light the candle .5. Let the candle burn fr tw r three minutes.6. Carefully put the jar ver the candle until the tp f the jar rests n the dish .7. Lk at the water in the jar. What bservatin can yu make?
What is happening?
As the candle burns, it uses up xygen in the air. When the candle stps burning, it has used up all the xygen in the air. The water inside the jar then rises. Hw far des the water rise? There is abut ne-fifth xygen in the air, s the water rises and fills abut ne-fifth f the jar.
Keep the candle burning! 让蜡烛燃烧！keep sth. (sb.) ding, 使某物（某人）保持做某一动作。eg. Dn’t keep the water falling. 不要再让水继续流了。 She kept me hlding the far with my hand. 她让我一直用手握住瓶子。
Language pints
1. D yu think science is interesting? 你认为自然有趣吗？science 科学；scientist自然科学，科学家eg. Wang Peng lves science very much. He wants t be a scientist. 王鹏非常喜欢科学。他想成为一名科学家。
2. a shallw dish with water一个装水的浅盘shallw adj. 浅的反义词：deep深的eg. Please pass me a shallw dish (plate). 请递给我一个浅盘子。The idea f the passage is very shallw. I can understand it. 这篇短文的意思很浅显，我能读懂它。
① light v. 点燃，照亮 It’s time t light up. 该点灯了。 It’s cld in the rm. Let’s light a fire. 房间里太冷了。咱们把火生起来吧。
3. light the candle 点亮蜡烛 = make the candle burn使蜡烛燃烧
② light n. 光，光线（不可数）；电灯（可数） The mn light cmes int the rm thrugh the windw. 月光透过窗子照进了房间。 Dn’t frget t turn ff the lights when yu leave. 当你离开的时候不要忘了关灯。
③ light adj. 颜色浅的（反义词dark）； （分量）轻的（反义词heavy） Rse likes the light green skirt. 罗斯喜欢那件淡绿色的裙子。 The bag is very light. Mary can carry it easily. 那个包很轻。玛丽能轻易地把它搬起来。
4. Carefully put the jar ver the candle. 小心地把瓶子倒扣在蜡烛上。carefully adv. 仔细地，小心地careful adj. 细心的，认真的care v. 关心；在意care(v.) + ful = careful (adj.) careful ( adj. ) +ly = carefully (adv.)Jenny is a careful girl. She des everything carefully. She ften cares fr thers. 詹妮是一个认真的女孩。她做任何事情都非常仔细。她经常关心他人。
5. As the candle burns, it uses up xygen in the air. 当蜡烛燃烧的时候，需要消耗空气中的氧气。
① as 在此为“当……的时候”。它有着多重意义。 Please d it again as I did. 请像我做的那样再做一遍。（像……一样） As it is late, I have t leave nw. 由于天太晚了，我得走了。（由于，因为） Yu will find the building as yu reach the end f the street. 当你走到这条街那头，你就会看到那座大楼。 （当……时候）
② use up用光，耗尽。表示完全，彻底。 He was hungry and ate up the bread. 他饿了，把面包全吃光了。（eat up吃光） Jim used up his mney t buy the cmputer. 吉姆为了买电脑花光了所有的钱。
6. The water inside the jar then rises. 这时瓶子里的水就会上升。rise v. 上升，升起（不及物）The sun rises in the east. 太阳从东方升起。The river is rising after the heavy rain. 大雨后河水上涨。注意：raise“提高，升起”（及物）Liu Fei raised her hand and asked a questin. 刘菲举手问了一个问题。
7. There is abut ne fifth xygen in the air, s the water rises and fills abut ne-fifth f the jar. 氧气在空气中占五分之一，所以水面上升并且占据了瓶子的五分之一。*分数的表达：
eg. 1/3，ne third 1/5, ne fifth 3/4, three furths 2/5, tw fifths
1. The water here is s______, nt deep.2. Let the fire b______ fr a few hurs. The rm will be very warm.3. Lk! The by is playing with sme ________ (火柴).4. There is little ______ (氧气) at the tp f the muntains.5. Mr. Black sat dwn and __________ (点燃) a candle.
I. 根据首字母或汉语提示，完成下列句子。
lit/ lighted
1. Please pass me the bttle full ______ water.2. He is s hungry that he has eaten ______ all the fd n the plate.3. I usually put the candle ______ the candle hlder.4. Mr. Ga came int the classrm ______ a bk in his hand.5. The rainy day will last ______ three days.
II. 用适当的介词填空。
1. 当蜡烛停止燃烧时，它已用光了空气中所有的氧气。When the candle _______ ________, it ____ ______ ______ all the xygen in the air.2. 我们班里五分之三是女生。_____ _____ f the students in ur class are girls.3. 为了完成那项工作，他工作了十个小时。____ _____ the wrk, he has wrked ____ ten hurs.
III. 根据汉语提示，翻译下列句子，每空一词。
stps burning
Three fifths
T finish fr