人教版高中英语必修三unit4全课件.ppt
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1、Unit4,Words,1. in time: sooner or later; eventually 迟早;最后;终于,in time (for sth/to do sth): not late 及时;不迟 She will be back in time to prepare dinner. 她来得及回来准备晚饭。,Ill see him in time. 总有一天我会遇见他。,in/out of time: in/not in the correct time 合/不合节拍,The audience clapped in time to the music.,观众合着音乐的节拍拍手。,b
2、e harmful to 对有害,do harm to sb. = do sb. harm 伤害某人,对某人有害处,1) Pollution is especially harmful to animals.,2) Smoking will do you a lot of harm.,It does no harm (for sb.) to do It does no harn for you to open the window.,There is no harm in (sb.s) doing sth. There is no harm in (your) opening the wind
3、ow.,2.,3.multiply (数目上)增加,增多;乘;(使)繁殖,1) Our problems have multiplied since last year.,2) 2 and 5 multiply to make 10.,4) The plants here multiply rapidly.,3) 6 multiplied by 5 is 30.,= Multiply 6 by 5 to make 30.,4.prevent sb from (doing) sth=stop sb from doing sth“阻止.做.” 在主动语态中from可以省略,被动语态中不行。 How
4、 to prevent/stop this (from) happening. Its nationals may be prevented/stopped from leaving the country. keep sb from doing sth中的from无论在主动语态中还是在被动语态中都不能省略。“ 阻止.做.”,如果省略from,意思为“让某人一直做某事“ He kept me from getting hurt. He kept me doing homework.,5.puzzle n. 谜;难题 v. (使)迷惑;(使)为难 Its puzzles me. feel/ be
5、 puzzled about sth. 对某事感到迷惑 puzzle over/ about sth. 对某事苦苦思索 这个字母使我迷惑不解。This letter puzzles me. 她对她的未来感到迷惑。She felt puzzled about her future. 他昨晚冥思苦想一道数学题。He puzzled over/ about a math problem last night. puzzling adj. 使迷惑的 puzzled adj. 迷惑的;困惑的,6.break out vt.也可以表示突然大声叫喊等。 The war broke out in 1937.
6、A fire break out last night. She broke out, “That is too unfair!” take place 表示“发生、举行、举办”,一般指非偶然性事件的“发生”,即这种事件的发生一定有某种原因或事先的安排。例如: The Olympic Games of 2008 took place in Beijing.,happen 作“发生、碰巧”解,常指具体事件的发生,特别指那些偶然的或未能预见的“发生”,一般用于偶然或突发性事件。例如: A storm happened across the river in another country. occ
7、ur 作“发生、想到、突然想起”解,其意义相当于 happen。例如: What has occurred? (= What has happened?) come about 表示“发生、产生”,多指事情已经发生了,但还不知道为什么,常用于疑问句和否定句。例如: When Mother woke up, she didnt know what had come about.,Reading,Whats the meaning of the word “Astronomy”?,I. Warming up,行星,the science of stars;,2. Do you know the f
8、ollowing terms?,star, planet, the sun / moon / earth, solar system,太阳系,3. How many planets are in the solar system?,8,恒星,Pluto,Scientists now think Pluto is too small to be called a planet.,4. Do you know the correct order of their distance to the sun?,nearest to the sun?,farthest to the sun?,5. The
9、 names of eight planets.,Mercury m:kjri Venus Earth Mars Jupiter du:pt Saturn stn Uranus jrns Neptune neptu:n, -tju:n,1) 水星 2) 金星 3) 地球 4) 火星 5) 木星 6) 土星 7) 天王星 8) 海王星,In this unit, well learn something more scientific. 1.Whats the title of the text?,2. From the title, we can predict that the text m
10、ay tell us the origin of life on the earth. Do you know some stories about it?,How life began on the earth,Pangu separates the sky from the earth.,Nvwa made humans.,1. When did the “Big Bang” happen?,Read the passage quickly and answer the questions.,2. What form was the earth after the “Big Bang”?
11、3. What made up the earths atmosphere,4. How did water come into being on the earth?,5. Whats the significance of the presence of water on the earth?,6.What was important to the development of fish? 7. What made possible the rise of mammals on the earth?,8. Why are mammals different from all life fo
12、rms in the past?,1. When did the “Big Bang” happen? It happened several billion years ago.,Scanning,Read the passage quickly and answer the questions.,2. What form was the earth after the “Big Bang”? The earth was still just a cloud of dust. 3. What made up the earths atmosphere after the earth expl
13、oded? Carbon, nitrogen, water vapour and other gases.,4. How did water come into being on the earth? As the earth cooled down after it exploded, water came into being.,5. Whats the significance of the presence of water on the earth? It allowed the earth to dissolve harmful gases and acids into the o
14、ceans and seas.,6. What was important to the development of fish? oxygen. 7. What made possible the rise of mammals on the earth? The disappearance of dinosaurs made the possible the rise of mammals on the earth.,8. Why are mammals different from all life forms in the past? They gave birth to young
15、baby animals and produced milk to feed them.,Close reading,I. Read the passage carefully and match the main idea with each paragraph.,Para. 1 The formation (形成) of the earth. Para. 2 The importance of water for life. Para. 3 A widely accepted theory about the formation of the universe. Para. 4 The a
16、rrival of humans and their impact on the earth. Para. 5 The development of plants and animals on the earth.,Detailed reading,Stage 1 : The development of the earth Stage 2 : The development of life,(para 13),(para 45),Stage 1: The development of the earth,(1) After the Big Bang, what was the earth l
17、ike?,a cloud of dust,a solid globe,exploded with fire and rock,produced water vapour and gases,(2) What happened next?,(3) What did the water vapour and gases form?,the earths atmosphere,Water appeared,(4) What appeared as the earth cooled down?,water is important for the beginning of life on the ea
18、rth.,Why is water so important for the beginning of life? Because water allowed the earth to dissolve harmful gases into oceans and seas.,?,Stage2 The development of life,small plants appears in water,1.What life developed after water appeared?,Shellfish and all sorts of fish,2.What life developed i
19、n water next?,green plants began to grow on land,insects appeared,3.What about the life on land?,amphibians on land and in the water,forests,4. What life developed next on land?,reptiles appeared,dinosaur developed,5.What life developed after forests appeared?,mammals on land,6.What life developed a
20、fter dinosaurs?,small clever animals,7. What life developed after mammals?,1.Who are the small clever animals with hands and feet? 2. Are they taking care of the earth well? Why?,?,Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth
21、into space.,The earth may become too hot to live on .,Can you fill in the blanks?,2,3,4 5,6,7 8 9 10,1 small plants in water,shellfish and all sorts of fish,insects,reptiles,amphibians,mammals,dinosaurs,humans,plants,animals,Green plants on land,forests,1. Insects and amphibians appeared. 3. The ear
22、th became a solid ball. 5. Reptiles appeared. 7. The earth was a cloud of dust 9. Shellfish and other fish appeared. 11. Clever animals with hands and feet appeared,2. Dinosaurs appeared. 4.Small plants grew on the water. 6. Plants began to grow on dry land. 8. Water appeared on the earth 10. The un
23、iverse began with a “Big Band”. 12. Mammals appeared.,8,3,10,9,11,5,1,7,4,12,6,2,Can you put the order of development of life into a time line?,Ex.2 on P27,III. Fill in the blanks in the following form.,Atoms,violent,atmosphere,presence,acids,oxygen,shellfish,amphibians,Reptiles,existed,gave birth t
24、o,clever,dioxide,IV. True (T) or False (F). 1. The earth appeared before the Big Bang happened. 2. The original atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Life began in water and then on land.,F,F,T,
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