1、 Unit 4 Astronomy:the science of the stars八大行星八大行星你知道吗？你知道吗？(水星）水星）（金星）（金星）（火星）（火星）(木星木星)(天王星）天王星）(土星土星)(海王星）海王星）（地球）（地球）Do you know any ancient idea about the beginning of the earth?Pangu separates the sky from the earthNvwa makes human beingsUnit 4Unit 4How Life Began on the EarthHow Life Began on
2、 the EarthFast reading:Skim the passage and match the main idea with each paragraph.Para.1 A.The formation(形成)of the earth.Para.2 B.The importance of water for life.Para.3 C.A widely accepted theory the Big BangPara.4 D.The arrival of humans and their impact(影响)on the earth.Para.5 E.The development
3、of plants and animals on the earth.The universe began with a“Big Bang”that threw matter in all directions.thPara 1 What is the widely accepted theory?1.When did the“Big Bang”happen?It happened several billion years ago.Para2-3.the earth and water came into being2.What form was the earth after the“Bi
4、g Bang”?The earth was still just a cloud of dust.3.What made up the earths atmosphere after the earth exploded?Carbon,nitrogen,water vapour and other gases.4.How did water come into being on the earth?As the earth cooled down after it exploded,water came into being.5.Whats the significance of the pr
5、esence of water on the earth?It allowed the earth to dissolve harmful gases and acids into the oceans and seas.1.Small plants in water2._ and all sorts of fish3.Green _ on land4._(on land)5.Amphibians(on land and in _)6.Plants grew into _.8._(on land)9._(on land)Para4 the development of life7._(on l
6、and)10._(small clever animals on land)ShellfishInsectswaterplantsforestsReptilesDinosaursMammalsHuman beingsPara5.What problem is caused by human beings?They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.The earth may become too hot to live on.HomeworkRead the text and try to retell how life began on the earth.
