1、必修3Before the classYou are supposed to be engaged in the material and in whatever it is that we are discussing in class,not necessarily thinking about getting down every word that I say.Id like you to take active notes rather than passive notes.Write down what can make you feel or learn something.Be
2、tter attention,better understanding of the material if you are actively engaged.Better attention,better understanding of the material if you are actively engaged.You are supposed to be engaged in the material and in whatever it is that we are discussing in class,not necessarily thinking about gettin
3、g down every word that I say.Id like you to take active notes rather than passive notes.Write down what can make you feel or learn something.Unit 4 ReadingHOW LIFE BEGAN ON THE EARTHRead the explanation and speak out the word it explains.sudden and powerful;using force to hurt or attack violentadj.猛
4、烈的；激烈的；强暴的harmfuladj.有害的atomn.原子existvi.存在；生存causing harm the smallest unit of any chemical element globen.地球；地球仪；球体to be,or to be real;to live,or to live in difficult conditions the world;a map of the world in the shape of a ball,which is fixed to a support and can be turned round at the same angle
5、 as the Earth turns in space;any ball-shaped objecttheoryn.学说；理论 multiplyvi.&vt.乘；增加a formal statement of the rules on which a subject of study is based or of ideas which are suggested to explain a fact or eventto increase very much in number,or(in mathematics)to add a number to itself a particular
6、number of times pron.&n.&adj.万亿；十亿billionthe number 1 000 000 000with this result adv.因此；于是 thusoxygenn.氧a colourless gas that forms a large part of the air on Earth and which is needed by people,animals and plants to livethe mixture of gases around the Earth;a feeling that a place has of being plea
7、sant and interesting or exciting atmospheren.大气层；气氛unlikeprep.不同；不像fundamentaladj.基本的；基础的different from forming the base,from which everything else develops(a length of)rings usually made of metal which are connected together and used for fastening,pulling,supporting,or limiting freedom,or as jewell
8、ery;a set of connected or related things any of various usually liquid substances which can react chemically with and sometimes dissolve other materials chainn.链子；连锁；锁链acidn.酸carbon dioxide二氧化碳the gas formed when carbon is burned,or when people or animals breathe out in time lay eggs give birth to i
9、n ones turn prevent from下蛋产生；分娩及时；终于阻止；制止轮到某人；接着Match1.To summarize and remember the main idea of the passage.2.To speak out the detailed information of the passage.3.To learn more knowledge about how life began on the earth.4.To learn some useful words,expressions and patterns in the passage.Object
10、ivesWords:theory,violent,unlike,fundamental,harmful,exist,thusExpressions:in time,lay eggs,give birth to,in ones turn,prevent fromPattern:What is even more important is that Skimming for general ideaReading Comprehension ISkimmingWhats the main idea of the text?A.A brief introduction on how human B.
11、beings were born.B.A brief introduction on the birth of the universe and life on the earth.C.The“Big Bang”had a great effect on the birth of the earth.D.The appearance of human beings was a disaster to the earth.Analyse the structure of the passage.Write down the main idea for each paragraph.Paragra
12、ph 1:Paragraph 2:Paragraph 3:Paragraph 4:Paragraph 5:Reading Comprehension IISkimmingParagraph 1:A widely accepted theory about the formation of the universeParagraph 2:The formation of the earthParagraph 3:The importance of water for lifeParagraph 4:The development of plants and animals on the eart
13、hParagraph 5:The arrival of humans and their impact on the earthScanning for specific information1.The earth is different from other planets in that _.A.it was caused by a“Big Bang”B.there is the continued presence of water on the earth C.there is air on the earth D.the atmosphere covers the earth R
14、eading Comprehension IIIScanning2.The plants grew before the animals because they provide _.A.nutrients for animals to absorb(吸收)B.oxygen for animals to breathe C.necessary temperature for animals to keep warm D.water vapour for animals3.Which of the following statements is true?A.The dust settled i
15、nto a solid globe between 4.5 and 3.6 billion year ago.B.The first small plants began to appear on the surface of the land.C.About 2.6 million years ago some small clever animals appeared and spread in the ocean.D.Dinosaurs died out long before human beings developed on the earth.Put the order of de
16、velopment of life intoa timeline.Use the reading passage to help you.1 Insects and amphibians appeared.2 Dinosaurs appeared.3 The earth became a solid ball.4 Small plants grew on the water.5 Reptiles appeared.6 Plants began to grow on dry land.Reading Comprehension IVScanning7 The earth was a cloud
17、of dust.8 Water appeared on the earth.9 Shellfish and other fish appeared.10 The universe began with a“Big Bang”.11 Clever animals with hands and feet appeared.12 Mammals appeared.Answer:10 7 3 8 4 9 6 1 5 2 12 11DM:SC:Read the passage and underlineall the discourse markers(DM)and sentence connector
18、s(SC).however,after that,next,later,finally,thus,as a result of thisand,but,becauseReading Comprehension VScanningDetailed ReadingThe development of the earthStage 1:The development of the earth(1)After the Big Bang,what happened?a cloud of dusta violent solid ball exploded with fire and rockproduce
19、d water vapour and gases(2)What happened next?(3)What did the water vapour and gases form?the earths atmosphereWater appeared which is important for the beginning of life on the earth.(4)What appeared on the earth then?(5)What did the water do?It allowed the earth to dissolve harmful gases and acids
20、 into the oceans and seas.1.Big Bang(threw matter in all directions)2.a cloud of dust3.a solid globe4.exploded with fire and rock5.produce the carbon,nitrogen,water vapour,How did the earth come into being?6.cooled down7.waterappeared8.harmful gases were dissolvedThe development of lifeextremely sma
21、ll plants(1)What life developed after water(2)appeared?Stage 2:The development of life in waterall sorts of fish(2)What life developed in water next?early shellfishgreen plants on land(3)What life developed after the life in water?insects on landamphibians on land and in the waterforestsStage 3:The
22、development of life on land(1)What life developed next on land?reptiles on landdinosaurs on land(2)What life developed after forests appeared?mammals on land(3)What life developed after dinosaurs?small clever animals(4)What life developed after mammals?Can you say the sequence of development of life
23、 on the earth?waterwater plantsshellfish fishland plantsland insectsamphibiansforestsreptilesdinosaursmammalsclever animalsDiscuss the question in groups.Group WorkDesign an activity on Earth DayWhat the activity is about?Why the activity is designed?When and where to do the activity?Who takes part
24、in the activity?What to be done in the activity?How can we protect the earth and make it a better place to live on?Individual activity注:另附 word 文档。点击此处链接I.Fill in the blanks.Finally about 2.6 million years ago some small _ animals,now with hands and feet,appeared and _ all over the earth._ they have
25、,_,become the most important animals on the planet.But they are not _ the earth very well.They are putting too much _ into the _,cleverspreadThusin their turnlooking aftercarbon dioxideatmospherewhich _ heat _ escaping from the earth into space._,many scientists believe the earth may become too hot
26、to live on.So _ life will continue on the earth for millions of years to come will _ whether this problem can be solved.preventsfromAs a result of thiswhetherdepend onII.Task-based reading.Complete the passage with the right sentences from the box below.A.So what is a star?B.Why are there some stars
27、 in the night sky that dont twinkle?C.The stars are far away from Planet Earth.Why do stars twinkle?Watching stars on a moonless night can be an interesting experience.Millions of stars twinkle as if they were playing hide-and-seek with ones eyes.Why do stars twinkle?(1)_ And the light from the star
28、s travels a very long distance to reach us.Actually very little of the light finally manages to reach us.Besides,it passes through the earths atmosphere before reaching us.As the light enters the atmosphere,something like dust interferes(干扰)its path.CSo,sometimes it is visible,and sometimes it is no
29、t.This effect is called twinkling.(2)_ Well,thats because they are not stars at all.They are planets.Planets do not twinkle because unlike stars,they do not have their own light.They are like the moon.They reflect light from the sun.(3)_ A star is born when lots of different gases,mainly hydrogen(氢)
30、get together.The gas particles(微粒)attract each other and slowly get compressed to form a huge mass of gases.And,as this mass grows,BAthe temperature inside grows too,until such time when it bursts like a bomb.This explosion(爆炸)creates a gas called helium(氦).The helium becomes its fuel and it continu
31、es burning.Thus a star is born.No wonder the heavier stars burn more furiously.They have bigger explosions,where more helium is released,providing more fuel.At the same time,these bigger and brighter stars have a shorter life.Why?Because they use up their fuel more quickly.The life of a smaller and
32、lighter star can be as much as 100 times longer.Things I can doEvaluationI can understand the reading passage.5 4 3 2 1Ive learned some basic knowledge about how life began on the earth.5 4 3 2 1I can understand and spell the new words and expressions and can use them in new situation.5 4 3 2 1I can
33、 understand the sentence patterns and write new sentences with them.5 4 3 2 1I need more practice in _.Think about what weve just learnt today.Study without reflection is a waste of time.After the classIts time to stop the class for you to look back in silence.Homework1.Read the passage again and review 2.the new words and expressions.3.2.发挥想象，连词成文(50-100字).lay eggs,harmful,give birth to,theory,prevent from,unlike,in ones turn,fundamental,exist,in time.
