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1、WELCOME TO MY ENGLISH WORLD !Step 1 Lead in Look at two pictures , try to give as much information as possible. Unit4 Astronomy: thescience of the starsStep 2 Warming up Do you know how many planets circle around the sun in our solar system ? What are they? Can you match the names with the planets?J
2、upiterUranusNeptuneSaturnMercuryMarsEarthVenus水星水星 金星金星 地球地球 火星火星木星木星土星土星天王星天王星 海王星海王星Step 3 A quizWhats the end of the world ?Its “ D ”.Whats the beginning of the world?Its “ W ”. Step 4 Pre-reading Each religion and culture has its own ideas about how life began on earth. What do you know ? In Chi
3、na, we all know that Pangu separates the sky from the earth. The Goddess Nvwa mended the heaven and created human beings. In western culture, God created the world in six days.Pangu separates the sky from the earth.Nvwa makes human beings.God created man.上帝造人上帝造人 What is the passage about? Step 5 Re
4、ading How life began on the earth. While-readingListen to the tape of the reading passage and match the main idea for each paragraph.Main idea of each paragrapha.The importance of water for life b.The development of plants and animals on the earth c.The formation of the earth d. A widely accepted th
5、eory about the formation of the universe dcab e. ThearrivalofhumansandtheirimpactontheearthParagraph5:Paragraph1:Paragraph2:Paragraph3:Paragraph4:e While-readingWork in pairs. Put the order of developmentof life into a timeline according to the reading passage. Put the order of development of life i
6、nto a time line.A.Insects and amphibians appeared.B.The earth became a solid ball.C.Reptiles appeared.D.The earth was a cloud of dust.E.Shellfish and other fish appearedF.Dinosaurs appeared. G.Small plants grew on the water.H.Plants began to grow on dry land.I.Water appeared on the earth.J.Mammals (
7、including humans )appeared.DBIGEHACFJ While-readingThink about what you have read and make choices.Why was the earth different from other planets?A It produced a lot of heat. B.The water remained.C Water disappeared. D.It was the oldest planet.Why was life able to develop on the earth but not on oth
8、er planets?A The earth had a solid shape. B. The earth did not have harmful gases in its atmosphere.C The water stayed on the earth but not on other planets. D.The earth was not too hot and not too cold.精品课件Why did the plants grow before animals came?A Animals needed plants to protect them from the
9、sun. B Plants provided oxygen for animals to breathe.C Animals could hide from hunters in forest.D It was easier for plants to grow.What problem is caused by human beings?A They exist everywhere on the earth.B They cause global warming.C They find new methods of growing crops.D They enjoy hunting an
10、d fishing.精品课件 Step 6 Looking and thinking Look at the following pictures and try to understand more of the reading passage.A cloud of dustA solid globe Explode atmosphere waterCells separatePlants in the waterEarly shellfish and fishPlants on landoxygenInsects and amphibiansReptiles Dinosaurs Mamma
11、ls Man had evolved from apes. The development of lifeAs a student, what little things can we do for the earth? to prevent the earth from getting hotter and hotter to slow down the problem getting worse We have only one earth!We should take care of the earth!精品课件Whether life will continue on the eart
12、h depends on human beings.Only if we care will we help,only if we help shall all be saved!Step 8 Homework 1.Read aloud the reading passage and underline the useful phrases and sentence patterns.2.Finish off Ex1and Ex2 on P. 28. Step 5 Summing upHow life began on the earth1. small plants in water2.sh
13、ellfish and all sorts of fish 3. green plants on land4. Insects (on land)5.amphibians (on land and in water) 6. forests7. Reptiles (on land)8. Dinosaurs (on land) 9. Mammals (on land) 10. small clever animals with hands and feet 11.humansWhat subjects do you learn at school?lChineselEnglish lmathema
14、ticslphysicslhistorylgeographylphysicslbiologylchemistrybrainstorminggeophysicsbiochemistry Task 3: Careful reading1. What was there on the earth before life could begin? Water vapour, carbon dioxide, oxygen, nitrogen and other gases. 2. Why do scientists think there has never been life on the moon?
15、 Because there is no water on the moon. 3. Why did animals first appear in the seas? Because water allowed the earth to dissolve harmful gases into the oceans and seas. 4. Why did green plants help life to develop? Because green plants can take carbon dioxide from the atmosphere and fill the air wit
16、h oxygen. 5. Why were mammals different from other animals? They were different because they produced their young from within their bodies. 6. How did water come into being on the earth? The explosion of the earth produced water vapor, which turned into water when the earth cooled down.Water Air Lif
17、e is the headspring of life.?How Life Began on the Earth Water_made it possible for life to begin to develop.WaterPlants encouraged the development of _.early shellfish and all sorts of fishLater _ appeared. land animals insectsamphibiansWhen plants grew into forests, _ appeared for the first time.reptilesSome huge animals, called _, developed.dinosaursWhen dinosaurs disappeared, _ became more important. mammals came into being and spread all over the world.What life developed after mammals? Humans同学们来学校和回家的路上要注意安全同学们来学校和回家的路上要注意安全
