浙江省桐庐分水高级中学高中英语必修三课件：UNIT4 PERIOD 1 WARMING UP .ppt

1、Period 1 Warming up&Reading How life began on the earthMain idea of each paragraphParagraph 1:Paragraph 2:Paragraph 3:Paragraph 4:Paragraph 5:1.A widely accepted theory about the formation(形成)of the universe 2.The formation of the earth3.The importance of water for life 4.The development of plants a

2、nd animals on the earth 5.The arrival of humans and their impact(影响)on the earthBig BangA cloud of dustSettle into a solid globeExplodewith fire&rock(produce carbon,nitrogen,vapour water,other gases)atmosphereCool downwater appeareddissolve harmful gases into Life beganLife developedSmall plants app

3、eared on the waterShellfish and all sorts of fishGreen plants grew on landmultiplied and filled the oceans and seas with oxygen;encouragednextlaterland animalsinsectsmany millions years laterAmphibiansforestsreptilesproduced young by laying eggsAfter thatdinosaursmammalsGave birth to young and produ

4、ced milk to feed younghumansFinally,2.6 billion years agoDisappeared 65 million years agoThe most important animalsThe beginning of life and the development of lifehoweverPut the order of development of life into a time line.1.Insects and amphibians appeared.2.Dinosaurs appeared.3.The earth became a

5、 solid globe.4.Small plants grew on the water.5.Reptiles appeared.6.Plants began to grow on land.7.The earth was a cloud 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

6、.107384961521211Now men become the most important animals on the planet.Because they are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.greenhouse effectglobal warmingAre they taking care of the earth well?Why?What will be the results?

7、ice in the North Pole meltswater level risesThe result is that The earth may become too hot for the lives to live on.The lives will not have enough clean air The lives will not have enough land to live on DiscussionMany scientists believe the earth may become too hot to live on.As a student,what lit

8、tle things can we do for the earth to make it a better place to live on?solar energy plant treesrecycle rubbish prevent desertificationsave waterpurify airWhether the earth is suit for humam beings to live on depends on human beings.Whether life will continue on the earth depends on human beings.Onl

9、y if we care will we help,only if we help shall all be saved!What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.The earth became so violent that it was not clear whether the shape would last or not.They were in time to produce car

10、bon,nitrogen,water vapour and other gases.What is even more important is that as the earth cooled downed,water began to appear on its surface.It was not immediately obvious that water was to be fundermental to the development of life.Why they suddenly disappeared still remains a mystery.So whether l

11、ife will continue on the earth for millions of years to come will depend on whether this problem can be solved.Difficult Sentences After the“Big Bang”,the earth was just a cloud of _ .It _ loudly with fire and rock,which were _to produce the water vapour,_ and other gases.Then small plants grew.They

12、 _and filled the oceans and seas with oxygen.Many millions of years later the first green plants began to _on land.When the plants grew into forests,_ appeared for the first time.They produced young generally by _eggs.dustexplodedin timemultipliedappearreptileslayingcarbon dioxideWhen dinosaurs disa

13、ppeared,_ became more important.Now small clever animals with _appeared and _all over the world.As time went by they covered the earth and they are putting too much carbon dioxide into the_,which _heat _ the earth into space.Whether life will continue on earth for millions of years to come will _whether this problem can be solved.mammalsspreadhands and feetatmospherepreventsfromdepend on