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1、 Unit 4 Unit 4How Life Began On The EarthHow Life Began On The EarthWarming-up and Reading恒星恒星star:star:本身能发出光和热的天体本身能发出光和热的天体, ,如如the the Vega & the SunVega & the Sun。过去认为这些天体的位。过去认为这些天体的位置是固定不动的置是固定不动的, ,但实际上恒星也在运动。但实际上恒星也在运动。行星行星PlanetPlanet : :是本身不发光发热，且围绕是本身不发光发热，且围绕着恒星转的天体。着恒星转的天体。Nine planets
2、Nine planets卫星卫星SatelliteSatellite : :按一定轨道绕按一定轨道绕行星行星运行的运行的天体，本身不能发光。天体，本身不能发光。The moon is a satellite of the earth.The moon is a satellite of the earth.月球是地球的卫星。月球是地球的卫星。彗星彗星cometcomet: :通称扫帚星，当它运行的轨道通称扫帚星，当它运行的轨道部分靠近太阳时经常出现长长的彗尾。部分靠近太阳时经常出现长长的彗尾。HalleyHalleys Comet s Comet 哈雷彗星哈雷彗星the Milky Wayth
3、e GalaxyThe Solar SystemHow many planets are there in the solar system? Mars火星火星Saturn土星土星Venus金星金星Mercury水星水星 Uranus天王星天王星Neptune海王星海王星Pluto冥王星冥王星Jupiter木星木星EarthHow many planets are there in the solar system?My Very Earnest Mother Just Served UN a PizzaMercury（水星）（水星）,Venus（金星）（金星）,Earth,Mars（火星）（
4、火星）,Jupiter（木星（木星),Saturn（土星）（土星）,Uranus（天王星）（天王星）,Neptune（海王星）（海王星）,Pluto（冥王星）（冥王星）Black holes Pangu separates the sky from the earthPangu turns into a myriad of thingsNuwa makes menSome ideas about the beginning of the universal 宇宙宇宙Examples: 1. PanGu separates the sky from the earth 盘古开天地盘古开天地 2.
5、 PanGu turns into a myriad of things 盘盘古化生万物古化生万物3. NuWa makes men 女娲造人女娲造人Are these scientific ideas?The Big Bang宇宙大爆炸宇宙大爆炸Do you know what a scientific idea is? 1.把把当作当作2.太阳系太阳系3.总有一天；及时总有一天；及时4.一般地说来一般地说来5.信赖；取决于信赖；取决于6.目前目前,现在现在7.做出选择做出选择8.现存的；存在的现存的；存在的9. 对对有害有害10.阻止，制止阻止，制止11. 和和一样好，一样好，又，也又，也
6、think of asThe Solar Systemin timegenerally speakingdepend on at presentmake choices in existencebe harmful toprevent/keep/ stopfromas well as12.允许某人做某事允许某人做某事13.把把装满装满14.是由是由导致导致15.成为成为一部分一部分16.太多的二氧化碳太多的二氧化碳17.从他们身体内部从他们身体内部18.按计划按计划/ 安排要做安排要做19. 冷却、降温冷却、降温20. 下蛋下蛋21. 随着时间流逝随着时间流逝22. 全球变暖全球变暖allow
7、/permit sb to do sth fillwith be caused by become/ be part of too much carbon dioxide from within their bodies be to do cool down lay eggs As time went by global warming1. 随后它会变成什么随后它会变成什么曾经是一个谜，直到最曾经是一个谜，直到最后这团尘埃开始慢慢地合成一个后这团尘埃开始慢慢地合成一个环绕太阳环绕太阳运转的运转的球状物。球状物。 What it was to become was a mystery until
8、 the dust began to slowly combine into a ball moving around the sun. 2.问题是地球（开始）变得问题是地球（开始）变得激烈动荡激烈动荡，不知，不知道这个固体形状道这个固体形状是否会继续存在下去是否会继续存在下去。 The problem was that the earth became violent because it was not clear whether the solid shape was to last or not. 3.它使得地球得以把它使得地球得以把曾经存在于大气层中的有曾经存在于大气层中的有害气体害
9、气体，溶解在海洋里溶解在海洋里。 It allowed the earth to dissolve harmful gases, which had become part of the earths atmosphere, into the oceans and seas. 4.在未来的千百万年中在未来的千百万年中，生命能否在地球上延，生命能否在地球上延续将取决于这个问题能否得到解决。续将取决于这个问题能否得到解决。 Whether life will continue on the earth for millions of years to come will depend on whe
10、ther this problem can be solved. Difficult Sentences: 地球猛烈爆炸起火地球猛烈爆炸起火, 并喷涌出岩石，这并喷涌出岩石，这些最终又产生了水蒸气、二氧化碳、些最终又产生了水蒸气、二氧化碳、氧、氮和其他气体，它们后来构成了氧、氮和其他气体，它们后来构成了地球的大气层。地球的大气层。 It exploded loudly with fire and rocks, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other ga
11、ses, which were to make the earths atmosphere.1. Listening :Listen to the tape and answer the following questions 1) Why do many people think that water was important for the beginning of life?2) How do human beings make the earth become warmer and warmer?1) Because it allowed the earth to dissolve(
12、溶解）溶解） harmful gases into the oceans and seas. 2) They are putting too much carbon dioxide into the atmosphere.back2. Reading comprehending: read the text carefully and finish exercise1 and 2 on page 26 and page 27Answers: 1. B C B B2. D B I G E H A C F J1. Whats the main idea of the text?How life b
13、egan on the earth.2. How many parts can the text be divided into?(para 1)(para2.3.4)Part 1: the appearance of waterPart 2 The development of living things. 1.向某人解释某事向某人解释某事2.迫使某人做某事迫使某人做某事3.靠近；接近靠近；接近4.感到高兴感到高兴/振奋振奋5.爆发爆发6.在阴凉处在阴凉处7.给某人拍照给某人拍照8.既然；由于既然；由于9.向前走向前走10.掉到地上掉到地上explain sth. to sb. force sb. to do sth. get/be close to cheer upbreak out in the shadetake photos of sb. now that step forward fall to the ground 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
