必修三 4.5unit 4 astronomy reading .ppt
新课标人教版课件系列,高中英语必修3-4.5,Do you know each religion or culture has its own ideas about the beginning of the universe?,1.Pangu separates the sky from the earth,2.Nuwa makes human beings,3.God created man.,The big Bang is used to describe a huge explosion that scientists believe happened around 15 billion years ago,created our universe.,Whats the sientific idea?,Unit 4:Astronomy:the science of the stars,Solar system:is made up of the sun and the objects that orbit(盘绕)it.These include the nine planets and their moons（卫星）,as well as comets（彗星）,and meteors（流星）.,Black hole:may eat everything that comes close to them.Sometimes they throw out material.That is how new stars and planets develop.,Fast Reading(Read the first paragraph),How did water come into being on the earth?,Why is important to have water on the earth?,The explosion of the earth produced water vapor,which turned into water when the earth cooled down.,It allowed the earth to dissolve harmful gases into oceans and seas.,Read the second and third paragraph,and finish the chart:,Small plants in water,_and all sorts of fish,green plants on _-,_dinosaurs_,_,Insects(on land),_(on land/in water),develop,appear,appear,Shellfish,amphibian,reptiles,mammals,land,forest,Can you put the order of development of life into a time line?,(A)insects and amphibians appear(B)a solid ball(C)reptiles appear(D)a cloud of dust(E)shellfish and other fish appear(F)dinosaurs appear(G)small plants grow on the water(H)plants begin to grow on dry land(I)presence of water(J)mammals(including humans)appear,1,2,3,4,5,6,7,8,9,10,Think 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 other 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.,Why was it necessary for plants to grow before animals?,A Animals needed plants to protect them from the 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 being?,A They exist everywhere on the earth.B They cause global warming.C They find new methods of growing crops.D They enjoy hunting and fishing.,Discuss:,Is the earth getting warmer each year?If so,what effects will this have?Whats the“green house effect”?,Yes.,?,Homework:Finish exercises1,2,3,4 on page 27,28Read the text again.,
