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1、lesson 26: keep the candle burning【學(xué)習(xí)目標(biāo)】知識(shí)目標(biāo):match, light, burn, shallow, candle holder, oxygen; one fifth, use up, be made up; light the candle. as the candle burns, it uses up oxygen
2、60;in the air. there is about one-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar. 能力目標(biāo):能夠描述實(shí)驗(yàn)步驟和實(shí)驗(yàn)現(xiàn)象。情感目標(biāo):讓學(xué)生形成尊重事實(shí)、用實(shí)驗(yàn)結(jié)果說話的態(tài)度和科學(xué)的世界觀。【重點(diǎn)及難點(diǎn)】能夠描述實(shí)驗(yàn)步驟和實(shí)驗(yàn)現(xiàn)象【導(dǎo)
3、學(xué)過程】一、自主預(yù)習(xí) 【預(yù)習(xí)指導(dǎo)】1. 自學(xué)教材第25課單詞與詞組,你可以聽錄音跟讀,根據(jù)音標(biāo)讀,或者請(qǐng)教別人讀。做到發(fā)音標(biāo)準(zhǔn),弄清詞性和漢語(yǔ)意思。2. 自學(xué)教材第68頁(yè)內(nèi)容,仔細(xì)讀課文至少三遍,弄清課文大意。 【自主學(xué)習(xí)】.(獨(dú)學(xué))自讀課文,了解文中的實(shí)驗(yàn)需要什么?要做什么?會(huì)發(fā)生什么? _ . 翻譯下列短語(yǔ)。 (1) a shallow dish with water _ (2) put the candle holder
4、0;in the dish_ (3) fill the dish half full of water_ (4) let the candle burn_ (5) 將罐子扣在蠟燭上_ (6) 當(dāng)蠟燭燃燒時(shí) _ (7) 用完所有
5、氧氣_ (8) 填充瓶子的大約五分之一_ . 在自學(xué)過程中,你還有哪些疑惑用橫線在文中畫出來,并把它寫下來,和你的同伴交流。 二、合作探究task 1. 讀課文,想一想下面的三個(gè)問題。 (1) what should you prepare(準(zhǔn)
6、備) when you do this experiment? _(2) in this experiment, where should you put the jar? _(3) how far does the water in the dish rise at last? _task
7、 2. 再讀課文,完成下列的實(shí)驗(yàn)步驟。how do we do the experiment? first, _the candle _the candle holder. then, _the candle holder _the dish. third. _the dish _water. fourth, _the candle. fifth, _the cand
8、le _for two or three minutes. task 3. 小組討論導(dǎo)學(xué)案上的language notes; 完成 let's do it 1、2。task 4. 分組做實(shí)驗(yàn),并用英語(yǔ)描述實(shí)驗(yàn)過程及結(jié)果。三、交流展示language points:1. when the candle stops burning, it has used up all the oxygen in the air.當(dāng)蠟燭停止燃燒時(shí),它已經(jīng)耗光了空氣中的氧氣。 use up 用盡;耗光。 例如:he has used up all his
9、energy. 他已筋疲力盡。by this time he had used up all his savings. 到這時(shí), 他的存款已全部用完。 2. because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.因?yàn)榭諝獾奈宸种皇怯裳鯕饨M成的,所以水會(huì)上升到瓶子五分之一的位置。 one fifth 五分之一分?jǐn)?shù)的表達(dá):1) 分?jǐn)?shù)由分子及分母兩部分構(gòu)成,分子用基數(shù)詞,分母用序數(shù)詞。2) 若分子為1,則分母的序數(shù)詞為單數(shù)形式,若分子
10、大于1,則分母的序數(shù)詞用復(fù)數(shù)形式, 如:3/5 three fifths。3) ½ one (a) half 或 one second (one-second)4) ¼ = one (a)quarter 或 one-quarter be made up of “用構(gòu)成或組成的”,指結(jié)構(gòu)成分,指人、物皆可。例如:i want my staff to be made up of excellent workers.我希望我的員工都非常出色。四、當(dāng)堂檢測(cè). 單項(xiàng)選擇。( )1. -would you li
11、ke to go to the movies? -yes, _ a. i would b. i'd like c. i'd love to ( )2. - _did they
12、160;come back? -two years ago. a. how long b. when c. how often ( )3. i want to have _to tell you.
13、a. anything interesting b. something interesting c. interesting something( )4. -lucy_ beijing next week. she wants to stay there for a week.
14、0;a. leaves b. is leaving for c. is leaving ( )5. -i hear that harbin is a good place_. a. to
15、160;go skiing b. of skiing c. for skiing ( )6.-the students couldnt go to school _the heavy snow. a. even though
16、 b. because c. because of ( )7. i saw mr. wang _ in the school library this morning. a. read b. reading
17、60; c. to read ( )8. there is _ rain this spring. the trees dont grow well. a. little b. a lit
18、tle c. a few ( )9.-is the baby a boy or a girl? -_ a. yes, it is b. its a boy &
19、#160; c. no, it isnt ( )10. the little boy is _ young _ look after himself, so his mother never leaves him alone at home.a. very, too
20、60; b. too, to c. so, that . 改錯(cuò)題。1. there are lots of matchs in the small box.2. can you let my uncle laughing?3. youre very ill, so you must stop to smoke.4. fill the dish half full of water.5.
21、there is about one five oxygen in the air.6. there are about two third students in the classroom.7. i used out my money. can you lend me some?. 用所給單詞的正確形式填空。1. you are very tired. youd better stop _ (have) a rest.2. you should put the jar over the candle _ (careful).3. what _ (observe) can you make?4. he _ (light) a candle and the room was bright.5. _ (two), ask the students to guess what will happen.6. he kept the candle _ (burn) for two hours.7. its time _ (play) basketball.8. what about _ (go) for a walk?五、作業(yè)布置1. 請(qǐng)根據(jù)課文內(nèi)容, 以 “an interesting experim
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