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1、Unit 4 Reading,HOW LIFE BEGAN ON THE EARTH,Read the explanation and speak out the word it explains.,in timelay eggsgive birth to in ones turn prevent from,下蛋产生；分娩 及时；终于 阻止；制止 轮到某人；接着,Match,Words: theory, violent, unlike, fundamental, harmful, exist, thus Expressions: in time, lay eggs, give birth to
2、, in ones turn, prevent from Pattern: What is even more important is that ,Focus on,Skimming for general idea,Reading Comprehension I,Skimming,Whats the main idea of the text? A brief introduction on how human beings were born. B. A brief introduction on the birth of the universe and life on the ear
3、th. C. The “Big Bang” had a great effect on the birth of the earth. D. The appearance of human beings was a disaster to the earth.,Analyse the structure of the passage. Write down the main idea for each paragraph. Paragraph 1: Paragraph 2: Paragraph 3: Paragraph 4: Paragraph 5:,Reading Comprehension
4、 II,Skimming,Paragraph 1:Paragraph 2:Paragraph 3:Paragraph 4:Paragraph 5:,The importance of water for life A widely accepted theory about the formation of the universe The development of plants and animals on the earth The formation of the earth The arrival of humans and their impact on the earth,Sc
5、anning for specific information,Detailed Reading,How life began on the earth,Stage 1: The development of the earth,(1) After the Big Bang, what happened?,a cloud of dust,a violent solid ball,1. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into
6、 a solid globe. 随后它会变成什么没人知道，知道38-45亿年前这团尘埃才慢慢地形成一个固体的球状体。,句中“What it was to become ” 是一个主语从句，在句中充当主语，谓语动词用单数。 （was to become ） be to do :注定要，必定会,2. (sth) be to (do) 还可以表示一下意义：,表示计划安排的事They are to get married next month. b. 表示责任义务I am to call them once I reach the airport. c. 表示说明、规定等的规定和要求This medi
7、cine is to be taken three times a day.,表示不会或没有大声（用于not/never, etc to be done）Anna was nowhere to be found.表示与将来事实相反的假设（用于虚拟条件句，只能用were to do）If we were to offer you more money, would you stay。,2. The earth became so violent that it was not clear whether the shape would last or not.violent: a. 暴力的,激烈
8、的词形变化:副词:violently a. She was in violent temper. 她暴跳如雷。,主语从句，it为形式主语，whether引到真正 的主语。（注：有or not时，只能用whether 不用if）,exploded with fire and rock,produced water vapour and gases,(2) What happened next?,3.They were in time to produce carbonin time:及时，终于in time (for sth/ to do sth)= not late The car came
9、to a halt just in time to prevent an accident. 汽车及时停下，避免了一场车祸。 b. Can we get to the station in time? 我们能及时到达车站吗？,Water appeared which is important for the beginning of life on the earth.,(3) What appeared on the earth then?,cool1) v. Please open the window to cool the room.,2) adj. 凉爽的，冷静的，沉着的，冷漠的，冷
10、淡的 be/get/seem/keep coolHis songs received a cool response from the public.,4. As the earth cooled down, water began to appear on its surface. 随着地球的冷却, 地球的表面就开始出现了水。,cool down,a.凉快起来，冷却,b.指人的心境“平静下来，使平静下来”,Dont cover the TV until it cools down.I tried to cool her down but she was still very angry wh
11、en she left.,(5) What did the water do?,It allowed the earth to dissolve harmful gases and acids into the oceans and seas.,1. Big Bang (threw matter in all directions),How did the earth come into being?,The development of life,extremely small plants,What life developed after water appeared?,Stage 2:
12、 The development of life in water,green plants on land,(2) What life developed after the life in water?,insects on land,amphibians on land as well as in the water,as well as 还，（除之外）也,可连接两个并列的谓语，其时态要保持一致。He sings as well as dances.可连接两个不定式，但后一个动词的不定式符号“to”要省略My mum doesnt allow me to play computer ga
13、mes as well as watch TV.,3. 在连接两个并列主语时，谓语动词要与前一个保持一致。He as well as I is playing football.用于否定句中连接两个主语时，若位于not前，两个都否定，若位于not后，则否定前者，肯定后者。Tom as well as Mark is not playing football now.Tom is not playing football as well as Mark now . Tom 和Mark 现在没在踢球。Tom 现在没有和Mark踢球。（ Mark正在踢球）,forests,Stage 3: The
14、development of life on land,(1) What life developed next on land?,reptiles on land,dinosaurs on land,(2) What life developed after forests appeared?,mammals on land,(3) What life developed after dinosaurs?,small clever animals,(4) What life developed after mammals?,Can you say the sequence of develo
15、pment of life on the earth?,water,water plants,shellfish fish,land plants,land insects,amphibians,forests,reptiles,dinosaurs,mammals,clever animals,Design an activity on Earth Day,What the activity is about? Why the activity is designed? When and where to do the activity? Who takes part in the activ
16、ity? What to be done in the activity? ,How can we protect the earth and make it a better place to live on?,Think about what weve just learnt today.,Time for Reflection,Study without reflection is a waste of time.,Think in English,After the class,Its time to stop the class for you to look back in silence.,Homework,Read the passage again and review the new words and expressions. 2. 发挥想象，连词成文(50-100字).,
