必修三Unit4Reading How Life Began on the Earth
Unit_4__How_Life_Began_On_The_Earth
oxygen Later, plants appeared, providing _________ for oceans and seas, in which some animals appeared. Then green plants began to grow on land, and land animals, forests, reptiles, and huge animals such as dinosaurs appeared. Dinosaurs’ disappearance _______________ made the rise of mammals possible. After human beings ________________, come into existence they put lots of carbon into the atmosphere, _____________ heat escaping from the earth into preventing space. As a result of it, life on earth is ____ ___________. in danger
Fill in the blanks according to Para.1 and Para.2
matter all directions. • The “Big Bang” that throw______in • After that, _____began to form and combine to atoms create stars and other bodies. • For several billion years after the “Big Bang”, the a cloud of dust earth was just _______________. • Between 4.5 and 3.8 billion years ago when the a solid globe dust settled into ______________. The earth exploded loudly with___________. fire and rock They were in time to produce__________________________ carbon, nitrogen, water vapour and other gases,which were to make the earth’s _________. atmosphere Then, as the earth cooled down, ______began to appear on its surface. water
人教版高中英语选择性必修第三册UNIT 4 Part I Reading and 同步练习含答案
课时把关练Part I Reading and Thinking基础知识练Ⅰ. 单词拼写1. Holidays are expensive and，for those on low w（工资），they are often unobtainable.2.Losing the basketball match last week was a b（激烈而不愉快的）disappointment for the team.3. I said goodbye to my friend as he got a（上，登上）the train at Beijing Railway Station.4. They enjoyed an income and lifestyle that many people would e（羡慕）.5. He saw the corner of a magazine sticking out from under the b（毛毯）.6. We must find ways to assure our children a d（相当不错的）start in life.7. The reforms are motivated by a g（真正的）concern for the disabled.8. My heart s（下沉）because I thought he was going to leave me behind.Ⅱ. 用所给短语的适当形式填空1. The little girl has several invitations to star at shows in order to concentrate on her studies.2. Nowadays many young people from the countryside finding good jobs in big cities.3. During Spring Festival，people like to firecrackers and put up spring couplets on the door.4. At dusk，I walked as far as the lake and then I made up my mind to .5. Mr. Smith was thirty minutes late for the meeting because he had been traffic jam.6. Faced with challenges，you’d better a good state of mind.7. I don’t know why you are so concerned—it isn’t your problem .8. Young people，and vitality，are like the sun at eight or nine in the morning.Ⅲ. 单句语法填空1. In my opinion，there is no evidence indicating that he is a （qualify）doctor.2. Before I entered the competition，I had mixed program of strength and （endure）training.3. I was always an （enthusiasm）reader，sometimes reading up to three books a day as a child.4. Never will I forget my first （assign）at the office of a popular English newspaper.5. If you don’t have an aim，you will drift like an （abandon）ship at sea.6. He asked me to take fewer （belong）as there was little room left in our car.7. With faith and （persevere），Goodall finally overcame all the difficulties.8. They made a （resolve）to go climbing Mount Tai on Sunday.Ⅳ. 一句多译1. 我下火车时碰巧在下雨，因此只好乘出租车。
Unit4How_life_began_on_the_earth语言点
4.The earth became so violent that it was not clear whether the solid shape would last or not.
地球开始变得激烈动荡，不知道这个固体形 状是否会继续下去。 n. 固体 (solid, liquid, gas )
Unit 4 How Life Began on the Earth Language points
1.No one knows exactly how the earth began, as it happened so long ago. as在这里表示原因, 意思是“因为” As he was ill, he needed more help. 仿写：没人明白他在说什么，因为那太难 理解了。
联想
be to do sth.
be + doing:_________ 正在… be + done:__________ 被动
(1)表示 禁止，命令 eg. You are not to smoke in this room. You are to be back by 10 o’clock.
(2)表示注定要
2) In one’s turn 轮到某人 in Sam's turn It will be _______________ to be on duty tomorrow.
20. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 阻止某人做某事 : prevent sb. (from) doing sth. stop sb. (from) doing sth. keep sb. from doing sth. 注意：keep sb. from doing sth.中from不
人教高中英语Book 3 Unit 4 Astronomy reading ---How Life began on Earth教学课件 (共34张PPT)
1. What made up the earth’s atmosphere after the earth exploded? Carbon, nitrogen, water vapour and other gases.
2. What’s the significance of the presence of water on the earth? It allowed the earth to
Reading
Unit4 Reading
How Life onthe the Earth How lifeBegan began on earth
Startling by each step
An alien from another planet
Learning Aims 学习目标 1.To talk about the development of life 2. To understand the details about the passage and retell it using key words. 3.To know how to protect our earth.
Reflection
It’s time for you to look back in silence and think about what we’ve learnning
Fill in the blanks on the blackboard and check if you have mastered the main idea of the text
Group Discussion
What problems are caused by human beings?
高中英语说课稿_unit4_How_life_began_on_the_earth
Unit 4 How Life Began On The Earth----说课人：王华一、教学背景的分析1、教材内容分析本单元的中心话题是“天文学”，内容涉及太阳系、地球上的生命起源、宇宙大爆炸、月球探秘、黑洞效应等，主要内容围绕地球上生命的起源展开的。
本次阅读课“HowLife Began On The Earth ”通过对宇宙大爆炸理论进行科学性分析，推断出地球上生命的由来以及生物进化的过程。
2、学生背景分析“ How Life Began On The Earth 这一”话题虽然有趣，但本文的文体属于科普类说明文，内容抽象，用词多专业术语，阅读本文对高一学生来说有一定的难度。
不过本文以时间为线索，使得学生较易读懂本文的内容。
通过对本文的阅读，学生不仅可以了解地球上生命的起源以及发展过程，还可以掌握一些相关的语言知识。
二、教学目标的分析1.知识目标：（1）让学生在阅读中学到一些有用的单词和句子。
（2）让学生了解生命的起源。
2.能力目标：（1）提高学生的阅读技巧：略读，细读和对本文组织结构的分析（2）拓展学生对地球上生物进化的知识。
3.情感目标：（1）培养学生对科学的兴趣并激起学生对天文学的喜爱。
（2）调动和加强学生的环保意识。
三、重点难点的分析重点：激发学生学习兴趣，使学生完成阅读任务，理解文章内容。
难点：使学生通过播放录音及略读获取文章信息。
四、教法和学法的选择1、教学方法（1.）使用任务型教学与 PWP 教学法，让学生明确学习目标。
（2.）设计问答活动来检查学生对本文的了解。
（3.）让学生在讨论中学会合作学习。
（4.）分别利用个人、同桌和小组活动来完成学习任务。
2.学法（1.）合作学习 : 采用小组合作和组间交流等活动形式。
（2.）自主探究法 : 以学生为主体，培养学生自主探求问题的能力，主要通过相关图片、问题激活学生固有背景知识，使其自主分析、归纳、解决问题。
五、教学过程Step I Leading-in (1mins)Free talk with Ss:what is the end of the“world ”?What is the beginning of the“world ”?设计意图：以脑筋急转弯的形式引发本课的话题Step II Pre-reading (3mins)11.Each religion and culture has its own ideas about how life began on earth. What do you know?2.Are they true for the beginning of the life? Do you know what a scientific idea is?3.Read the title and look at the pictures. Can you predict what the reading will be about?设计意图：进一步激发学生的学习兴趣，激活其已有的知识，贴近了学生生活，又可以让学生对新单元的内容产生一种期待和渴望，使学生在心理上和认知上做好准备，激发他们对课文的学习兴趣并进行积极思考，从而培养其创造性的思维能力。
unit-4-astronomy-How-life-began-on-the-earth
Test your common knowledge:
1. Who is the first Chinese astronaut to go into
Yang liwei space? ___________ 2. What was the date when he circled the earth in space? A) November 15, 2003 B) October 15, 2003 C) September 17, 2004 D) December 17, 2004 3. Which country first sent people up to the space, the USA or the Soviet Union? 4. So far, how many countries have succeed in three sending people up to space? _______
2) What’s the significance of the presence of water on the earth?
It allowed the earth to dissolve harmful gases into oceans and seas.
significance --- significant (adj.) harmful --- harm (n.)/ (v.) do harm to
• 1) Dinosaurs died out long before human
back beings developed on the earth . • 2) Because they have larger brains than any back other creatures on the earth so far. • 3) Yes. If so, the earth will be so hot that no life will exist（存在）on the earth any more. To solve this problem, people should protect the earth carefully, they must stop putting too much carbon dioxide into the air , reduce pollution, control the population and so on .
人教版英语必修三Unit 4(Reading)教案(反思)
How Life Began on The Earth教学内容：人教版高中英语必修3第四单元阅读Ⅰ. Teaching important and difficult points:1. Enable the Ss to master the main idea of the text.2. Get the Ss to understand how to finish the exercises of the text.Ⅱ. Teaching aims:Knowledge aims:1. Let the Ss master the key words.2. Lead Ss to learn the usage of useful sentence structures.Ability aim:Develop the Ss’reading ability and let them use some reading strategies such as skimming, scanning, and so on.Emotional aims:1. Enable the Ss to understand how life began on the earth.2. Get the Ss to be aware of the importance of protecting our earth.渗透法制教育: 在上课过程中给学生渗透与《中华人民共和国环境保护法》相关的内容。
Ⅲ. Teaching methods:Task-based teachingDiscussionCooperative learningⅣ. Teaching procedureStep 1 LeadingUse a short film to lead the Ss to understand the origin of life on the earth.Step 2 Pre-readingAccording to the development of life, let the Ss divide the text into several parts, then ask them to finish the following questions.1. How many parts are there in the passage?2. What dose each part mainly talk about?Step 3 While-reading1. How many steps are there before the earth formed?2. How many steps are there during the development of life?3. Read the whole text and fill the following blanks.Nobody knows how the earth , however, there are a widely accepted , the universe began with a which threw matter in all directions. At that time, the earth was still a cloud of ,after that, the earth had become with its atmosphere, which formed with dioxide, nitrogen and so on. And thenalso appeared on the earth, which was fundamental to development of life.After many millions of years, the first extremely small began to appear, later the early and all sorts of fish also appeared in the water. And then different plants and animalson land. Later the huge animals, called , appeared.Finally some clever animals with and feet appeared, they become the most important animals on the . However, they may let the earth become too to live on.4. Finish the following exercises according to the whole text.(1) why was life able to develop on the earth but not on other planet?A. The earth had a solid shapeB. 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.(2) 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 breath.C. Animals could hide from hunters in the forest.D. It was easier for plants to grow.(3) what is the correct order according to the text?①The clever animals with hands and feet appeared andspread to grow.②The “Big Bang”.③Small plants began to appear on the surface of the water.④65 million years ago of the dinosaurs ended.A. 2 1 3 4B. 4 3 1 2C. 2 4 3 1D. 2 3 4 1(4)What is the main idea of the text?A. The formation of the earth.B. The humans let the earth become too hot to live on.C. The development of dinosaurs.D. The origin of life on the earth.Step 4 Post -readingRead the text and do the true-or-false questions.(1) Human beings have known the origin of the earth clearly so far. ( )(2) the appearance of water made it possible for plants and animals to live on the earth.( )(3) Plants first appeared on land and then in the water.( )(4) Dinosaurs existed on the earth for over 140 thousand years. ( )(5) It is human beings that are not looking after the earth very well and have caused global warming.( )Step 5 Summary1. How the earth formed .2. The development of life on the earth.3. The earth needs us to take care of it.Step 6 Homework1. Please retell the passage in your own words.2. Finish the exercises in your books.教学反思：本堂课总体达到了预期的教学效果，有不少亮点，但是其中也有许多的不足。
人教必修三unit4课文精讲
[句型] begin with/start with 以……开始， 从……着手
[仿写] 认识从实践开始。 Knowledge_b_e_g_i_n_s_w__it_h__p_r_a_ct_i_c_e_______.
what 引导的主语从句，what 作become 的表语，when引导的是定语从句，
• 没有人确切知道地球是怎样开始形成的，因为在很早很早以前它 就形成了。然而，一种普遍为人们所接受的理论是：宇宙起源于 一次大爆炸，这次大爆炸将物质投射到四面八方。然后，原子开 始形成并结合成恒星和其他天体。
1.according to 根据 2.widely accepted 广泛接受的 3.began with=start with 起源于，开始于 4.in all directions=朝四面八方
It is no wonder that he has passed the exam.
主语从句
that引导表语从句
• What many scientists believe is that the continued presence of water
allowed the earth to dissolve harmful gases and acids into the oceans
III. Fast-reading
1.Do you believe in such stories? Are they based on science?
2. In this unit, we’ll learn something more scientific. 3. What’s the title of the text?
4. From the title, we can predict that the text may tell us the origin of life on the earth.
高考英语总复习必修3Unit4 Astronomy the science of the stars
billion dollars: Mom-and-pop carmakers are unlikely to beat the biggest car companies. _十__亿___
倍数＋as...as...
迈步的时候，我发觉我被送出去很远，步子的跨度竟是在地球上
的两倍远，因而我摔倒了。
句型公式
教材原句
“Oh, dear，” I cried, “walking does need a bit of practice 句型 3：now that 引 __n_o_w__t_h_a_t_g_r_a_v_i_t_y_h_a_s__ch__a_n_g_e_d___．”
着地球引力的增加，宇宙飞船的外层燃烧起火。
二、语境强化训练 Ⅰ.语境填词——根据提示写出该词的适当形式 1．Newton was one of the greatest __p_h__y_si_c_is_t_s__ (物理学家) in the world and many
people admire him very much. 2．The old scientist told his students that scientific __t_h_e_o_r_ie_s____ (理论) must be based on
这就产生了连锁反应，使生命的发展成为可能。
But when I tried to step forward, I found I was carried 句型 2：倍数表达法： ___tw__ic_e__a_s_f_a_r_a_s____ on the earth and fell over. 但当我试着向前
Unit4Howlifebeganontheearth教学设计资料
Unit 4 How life began on the earth教学设计【教学内容】How life began on the earth(人教新课标)·英语·高一(必修3) ·Unit 4 Astronomy:The science of the stars·Reading【教材分析】本单元的中心话题是“天文学”，内容涉及太阳系、地球上生命的起源、宇宙大爆炸、月球探秘、黑洞效应等，主要内容是围绕地球上生命的起源展开的。
How life began on the earth这篇阅读文章讲述了地球上生命的起源，所使用的文体是说明文。
文章通过对宇宙大爆炸理论进行科学性分析，推断出地球上生命的由来以及生物进化的过程。
【学情分析】教学对象为高一的学生。
经过高一上学期的英语学习，他们已经储备了一定的高中英语词汇和基础知识，认知和分析水平比初中阶段有了进一步的提高，能就给出的话题展开讨论，发表自己的看法，渐渐具备了用英语获取信息、处理信息、分析问题和解决问题的能力。
学生对“天文学”这一话题并不是很陌生，由于本篇阅读文章的脉络清晰、结构分明，读起来很有趣味，引人入胜，给学生留下了很大的思考空间，能够激发学生的想象力，积极去探索文意，了解生命的起源以及生物进化的过程。
所以在设计这堂课时，我重点从学生对“天文学”这一话题的兴趣出发，设计探究点，借助电影片段创设情景。
在合作探究的基础上，感悟、体验生命起源及生物进化过程的科学性。
【教学目标】1、能力目标：通过学习，使学生能读懂文章内容，理清文章脉络，总结地球上生命的由来以及生物进化的过程。
通过速读、细读和设计问题的引导，培养学生获取、分析和处理信息的能力。
创设问题情境，在质疑、探究的学习过程中，培养学生独立思考、推理、判断和创造性思维能力。
2、情感目标：通过学习本篇文章，让学生了解地球上生命的起源以及生物进化的过程，培养学生对科学的兴趣，激发学生探索科学的热情，以及增强学生保护地球的意识。
人教版高一英语必修三Unit 4课文翻译
人教版高一英语必修三Unit 4课文翻译Unit 4 Astronomy:the science of the stars —Reading—HOW LIFE BEGAN ON THE EARTH地球上生命的起源No one knows exactly how the earth began, as it happened so long ago. However, according to a widely accepted theory, the universe began with a "Big Bang" that threw matter in all directions. After that, atoms began to form and combine to create stars and other bodies.没有人确切知道地球是怎样开始形成的，因为在很早很早以前它就形成了。
然而，一种普通为人们所接受的理论是：宇宙起源于一次大爆炸，这次大爆炸将物质投射到四面八方。
然后，原子开始形成并结合成恒星和其他天体。
For several billion years after the "Big Bang", the earth was still just a cloud of dust. 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. It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and other gases, which were to make the earth's atmosphere. What is even more important is that as the earth cooled down, water began to appear on its surface.大爆炸后好几十亿年过去了，但地球还只是一团尘埃。
【精品】高中英语(人教版 必修3)教师用书：Unit 4 Section_Ⅱ Warming Up
人教版英语精品资料Section_ⅡWarming Up & Reading — Language Points(一)词义匹配1．atmosphere A．a group of related parts which work together forming a whole 2．system B．the mixed gases that surrounds the earth3．fundamental C．for that reason; for this reason4．theory D．increase, add to the number of5．thus E．very important or necessary6．multiply F．idea that tries to explain something答案：1～6 BAEFCD(二)用所给词的适当形式填空7．A big violent (violence) earthquake occurred last week.8．Being exposed to the sunlight for a long time will be harmful (harm) to one's skin.9．Unlike (like) his brother, he is talkative (健谈的) and has a sense of humour.10．The puzzling(puzzle) problem made students present puzzled (puzzle)．1．violent adj.猛烈的；激烈的；强暴的★背诵佳句培养语感(教材原句)The earth became so violent that it was not clear whether the shape would last or not.地球(开始)变得激烈动荡，不知道这个固体形状是否会继续存在下去。
Unit4How-life-began-on-the-earth-优秀公开课课件
类） 7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups .
1.insects
2.plants 3.reptiles（爬行类） 4.shellfish（贝类）
5.fish 6.amphibians（两栖
类） 7.mammals(哺乳类)
Study of the groups of life (生命的种类/物种) Look at the pictures and tell the groups .
5.___a_m__p_h_i_b_ia_n_s_(on land and in water) 7.__r_e_p_ti_l_es__(on land)
6. forests
8. dinosaurs (on land) 9.__m_a_m__m_a_l_s(on land)
Questions:
1) How did water come into being on the earth?(Para.2)(2) The explosion of the earth produced water vapour, which turned into water when the earth cooled down.
Para.2
1. What is the original earth’s atmosphere made up of?
carbon, nitrogen, water vapour, and other gases
人教版高中英语必修三英语同步训练：Unit4训练一WarmingUpandReading(附答案).docx
高中英语学习材料***鼎尚图文理制作***Unit 4Astronomy：the science of the stars训练一Warming Up and ReadingⅠ.写出下列单词的正确形式1．violence ______(形容词)2．religious ______(名词)3．like(prep.)______(反义词)4．harm______(形容词)5．astronomer______(名词：天文学)6．explode______(名词)7．disappear ______(名词)8．global______(名词)9．develop______(名词)10．existence______(动词)Ⅱ.把下列短语译成英语或汉语1．in all directions ______2．______及时；迟早3．cool down______4．______也，又；和……一样好5．lay eggs ______6．______ 产生；分娩7．in one's turn______8．______ 阻止；制止9．as a result of...______10．______ 依靠；取决于Ⅲ.单词拼写1．As we climbed up the mountain，the dangers and difficulties ______(增加)．2．A solution has not yet been found to the ______(基本的)problems of industrial relations. 3．The gas given off by automobiles is h______ to people's health.4．The present ______(制度)of education needs to be improved.5．It seems good in t______，but it doesn't work in practice.6．Will you help me with this crossword p______？It got me stumped.7．The a______ of the city is very much polluted.8．With the d______ of modern agriculture and industry，our everyday life has improved a lot. 9．G______ speaking，girls are better at learning to speak languages than boys.10．The Chinese government did very well in p______ SARS from spreading.答案：Ⅰ.1.violent 2.religion 3.unlike 4.harmful5.astronomy 6.explosion7.disappearance8.globe9.development10.existⅡ.1.四面八方 2.in time 3.冷却下来；冷静4.as well as 5.下蛋 6.give birth to7.轮到某人；接着8.prevent...from9.由于10.depend onⅢ.1.multiplied 2.fundamental 3.harmful4.system 5.theory 6.puzzle7.atmosphere 8.development9.Generally10.preventing课堂巩固Ⅰ.阅读HOW LIFE BEGAN ON THE EARTH，回答下列问题1．How were stars and other bodies created?A．Atoms combined to create them.B．Clouds of dust combined to create them.C．Water combined to create them.D．Gases combined to create them.2．Which is the most important for life appearing on the earth?A．Fire.B．Rock.C．Water. D．Clouds.3．It can be known from the passage that ______.A．plants and animals appeared on the earth at the same timeB．plants appeared later on the earth than animalsC．early shellfish appeared earlier than plantsD．animals appeared later on the earth than plants4．How many years did dinosaurs exist on the earth?A．More than 140 billion years.B．More than 140 million years.C．More than 140 thousand years.D．More than 140 years.5．Why can the earth become too hot to live on?A．Small clever animals produce more heat.B．Small clever animals produce too much carbon dioxide.C．Small clever animals don't want heat to escape from the earth.D．Small clever animals like to live in a hot planet.Ⅱ.用方框里短语的正确形式填空1．—Did you catch your plane?—Yes，we got there just__________.2.The dish tastes good after it______.3．We are repairing the roof ______painting the walls.4．—Will you go fishing this afternoon?—Well，it all ______the weather.5．Lacey has a back injury that may __________her ______playing in tomorrow's game.6．When school began last summer，most of us met __________.7．Mice scattered __________ when a cat appeared.8．__________ teamwork，they finished the task ahead of time.9．She __________ a fine healthy baby last night in this hospital.10．The soldier managed to __________ the enemy's prison.Ⅲ.选词填空(in time，on time，in no time，at one time，at times，at any time)1．—Why are you in a hurry to leave here?—To get home ______ to bathe the children.2．These buses are never ______ and the passengers are always complaining.3．While I am away，please call me ______ if someone comes to see me.4．You can't imagine this lake used to be a beautiful place in our province ______.5．He rushed out of the kitchen ______ when he heard the shout.6．______ I sit silently and wonder if this kind of job is worth all the effort.答案：Ⅰ.1.A 2.C 3.D 4.B 5.BⅡ.1.in time 2.cools down 3.as well as 4.depends on 5.prevent；from 6.for the first time7.in all directions8.As a result of 9.gave birth to10.escape fromⅢ.1.in time 2.on time 3.at any time4.at one time 5.in no time 6.At times提示：in time“及时”；on time“按时”；in no time“立即，马上”；at one time“曾经”；at times＝sometimes“有时”；at any time“在任何时候”。
高中英语人教版必修3习题：Unit 4 Section 2 Word版含答案
Section_ⅡWarming_Up_&_Reading_—_Language_Points二、这样记短语三、这样记句式uncertain until between 4.5 and 3.8 billion years ago ...随后它变成什么没人确定，直到45～38亿年前……中作主语。
better than what we alreadyhave.我们得不到的东西似乎比我们已经拥有的东西好。
2.The earth became so violentthat it was notclearwhetherthe shape would last or not.地球(开始)变得如此激烈动荡，以至于不知道这个固体形状是否会继续存在下去。
so ...that ...“如此……以至于……”，引导结果状语从句。
He worked so_hard_that hemade great progress.他学习如此努力以至于他取得了巨大进步。
3.This produced a chainreaction, which made it possible for life to develop.这就产生了一个连锁反应，使生命的发展成为可能。
“make＋宾语＋宾语补足语”复合结构。
George made_it_clear_that hedisagreed.乔治表示得很清楚了，他不同意。
4.So whether life will continue on the earth for millions of years to come willdepend on whether this problem can be solved.所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。
第一个whether引导主语从句。
Whether_we_will_hold_a_meeting is not decided.我们是否要开一个会，还没有决定。
高一英语必修三 UNIT 4课文详解
ter when the plants grew into forests, reptiles appeared for the first time. 后来，当植物长成了森林的时候，爬行动物首次出 现了。
6.They produced young entirely by laying eggs. 他们一般是通过 孵蛋而繁衍后代的。
Par 4
1.Many millions of years later, the first extremely small plants began to appear on the surface of the water. 好几百万年后，水 的表面开始出现了极小的植物。 2.They multiplied and filled the oceans and seas with oxygen, w hich encouraged the later development of early shellfish and all sorts of fish. 他们繁殖起来就使得海洋充满了氧气，这为早期的 贝类及其他各种鱼类后来的进化创造了条件。 3.Next, green plants began to grow on land. They were followed in time by land animals. 接着，绿色植物开始出现在陆地上。 4.Some were insects. Others, called amphibians, were able to live on land as well as in the water. 随后，陆地上出现了动物， 其中有一些是昆虫，另外一些叫两栖动物，他们既能在陆上生活 ，也能在水里生存。
5. What is even more important is that as the earth cooled down, water began to appear on its surface. 更为重要的是，地球冷却 了下来，地球的表面就开始出现了水。
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B. 木星 Jupiter ______
C. 火星 ______ Mars D. 水星 Mercury ________
E. 海王星 Neptune _______
Pluto(冥王星)? a dwarf planet
1111
In our solar system eight planets circle around the sun.
The Solar System
In our solar system eight planets circle around the sun.
The Solar System
Can you name the eight planets?
Earth A. 地球 ______ Saturn F. 土星 ________ G. 天王星 Uranus _______ H. 金星 ________ Venus
solar energy
plant trees
B3 Unit 4 Reading：How life began on the earth
Warming up
Chinese Legends (传说)
Pangu separates the sky from the
earth.
His whole body then turns into all
Greenhouse effect
discussion
the earth may become too hot
putting too much carbon dioxide into the air
No life will be on the earth
As a student, what little things can we do for the earth?
mammals
Man had evolved from apes.
That’s the development of life.
The earth is our only one home. Are we taking good care of the earth? What problems are humans causing ?
kinds of things in the universe.
Legend: The Goddess Nuwa mended the heaven and created human beings from the clay(粘土).
The Western Religious Beliefs
3. Why is it wrong in films and stories to show dinosaurs and people together? Because dinosaurs died out long before human beings developed on the earth.
2
shellfish and all sorts of fish
4 insects 5 amphibians 7 reptiles 8 dinosaurs 9 mammals 10 humans
6 forests
• • • • • • • • • • • •
Page 27 Put the order of development of life into a time line. （8 ） 1 Insects and amphibians appeared. 10 （ ） 2 Dinosaurs appeared. （3 ） 3 The earth became a solid ball. （5 ） 4 Small plants grew on the water. （9 ） 5 Reptiles appeared. （7 ） 6 Plants began to grow on dry land. （2 ） 7 The earth was a cloud of dust. （4 ） 8 Water appeared on the earth. （6） 9 Shellfish and other fish appeared. （ 1）10 The universe began with a “Big Bang”. 12 （ ）11 Clever animals with hands and feet appeared. 11 （ ）12 Mammals appeared.
settled into
2
a cloud of dust 4
Cool down
a solid globe
explode with fire and rock
3
dissolve harmful gases and acids
water
atmosphere:
carbon,
nitrogen, water and other gases
B3 Unit 4 Astronomy: the science of the stars
浙江省余姚中学 卢建立
Astronomy：
the scientific study of the universe and the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it.
the Big Bang
Para. 2 The formation(形成) of the earth . Para. 3 The importance of water for life. Para. 4 The development of plants and animals
onthe earth.
According to Bible (圣经), God created the world and the first man, Adam (亚当) and the first woman, Eve (夏娃).
How life began on the earth
skimming
Para. 1 A widely accepted theory –
2. What is fundamental to the development of life?
Water.
3. Which kind of life-being first appeared on the earth, plants or animals? Why?
At first, small plants began to appear
seas.
Stage2 The development of life(p4-5)
Read Para. 4-5 and fill in the blanks.
Evolution of life on the earth
plants
animals
1small plants in water 3 green plants on land
As the earth cooled down
Why is water so important for the beginning of life? Because water allowed the earth to
dissolve harmful gases into oceans and
4. There used to be nine planets in the solar system. Recently scientists have decided that one of them can no longer be considered a planet. Do you know the name of that planet? Do you know why they removed it? Pluto. Scientists now think it is too small to be called a planet.
Detailed reading
1. Why was the earth different from other planets? The water remained. 2. Why did the plants grow before the animals came? Because plants provide oxygen for animals to breathe.
5. What problem is causese global warming.
The development of the earth and the life on the earth
A theory: The Big Bang
1
Para. 5 The arrival of humans and their impact
on the earth.
Task 1:
How does the author develop the passage?
A. Give examples（举例） B. In time order（以时间顺序） C. Comparison（比较）
small plants in the water
early shellfish and fish
insects and amphibians green plants on land
insects and amphibians
reptiles
mammals
dinosaurs
reptiles
dinosaurs
Task 2:
What’s the writing style of the text?
A. Narrative 记叙文 B. Explanation 说明文 C. Essay 散文