1、 Read paragraph 1,and answer the following questions.1.How did water come into being on the earth?2.What is the significance of the presence of water on the earth?The explosion of the earth produced water vapour,which turned into water when the earth cooled down.It allowed the earth to dissolve harm
2、ful gases into oceans and seas.Reading-II-skimming(3m)Put the order of development of life into a time line.A.insects and amphibians appearB.a solid ballC.reptiles appear D.a cloud of dustE.shellfish and other fish appearF.dinosaurs appear G.small plants grow on the waterH.plants begin to grow on dr
3、y landI.presence of waterJ.mammals(including humans)appearDBIGEHACFJStage 1:The development of the earth(1)After the Big Bang,what was the earth like?a cloud of dust a solid globe exploded with fire and rock produced water vapour and gases(2)What happened next?Water appeared(4)What appeared as the e
4、arth cooled down?water is important for the beginning of life on the earth.Why is water so important for the beginning of life?Because water allowed the earth to dissolve harmful gases and acids into oceans and seas.Stage2 The development of lifeStage2 The development of life small plants appears in
5、 water 1.What life developed after water appeared?Shellfish and all sorts of fish 2.What life developed in water next?green plants began to grow on land insects appeared3.What about the life on land?amphibians on land and in the waterforests4.What life developed next on land?reptiles appeared dinosa
6、ur developed 5.What life developed after forests appeared?mammals on land6.What life developed after dinosaurs?small clever animals7.What life developed after mammals?What are they doing on the earth?Because they are putting too much carbon dioxide into the atmosphere,which prevents heat from escapi
7、ng from the earth into space.The earth may become too hot to live on.1.Insects and amphibians appeared.3.The earth became a solid ball.5.Reptiles appeared.7.The earth was a cloud of dust9.Shellfish and other fish appeared.11.Clever animals with hands and feet appeared2.Dinosaurs appeared.4.Small pla
8、nts grew on the water.6.Plants began to grow on dry land.8.Water appeared on the earth10.The universe began with a“Big Band”.12.Mammals appeared.831091151741262Ex.2 on P277.Conclude the main idea of each paragraph.1)A widely _ about the _ of the universe.2)The formation of the _.3)The _ of water for
9、 life.4)The development of _ and _ on the earth.5)The arrival of _ and their _ on the earth.The text mainly tells us the _ of the earth and the _ of life on it.8.The main idea of Reading1.Ex.1 on P27theoryoriginearthimportanceplantsanimalshumansinfluence/effectformationdevelopmentHow life began on e
10、arth is one of the biggest puzzles that scientists found hard to solve.What other puzzles are hidden in the passage?Ex.5 on P27How does the universe(earth)form?Why did the earth cool down?Why did water disappear on other planet?How did the dinosaur disappear?1.Finish the exercise 1and 2 on page 63 2.Read the text again and find out your difficult points.
