How life began on the earth课文文本
Unit 4 How Life Began On The Earth
Neptune Saturn Uranus Venus Earth Jupiter
Mercury Venus Mars
唐智（Daniel）
When I was on the moon, I could not help praising how beautiful the earth is. It was really a masterpiece(杰作） by God.
Read and think (Para.3)
⑴ Did water only appear on the earth? ⑵ Is water important to the development of life? Find a word in Para.3 to prove your idea. fundamental
Homework
⑴ Use you own words to retell the text. ⑵ Find as much information as possible about the Big Bang from the library and on the Internet. Then make a presentation to all the class in the next period.
It will prevent heat from escaping from the earth into space. As a result, the earth may become too hot to live on.
Global warming
Discussion
⒈ “No one knows exactly how the earth began”. (a theory) In my opinion, the Big Bang is believeable/unbelieveable, because______. ⒉ “…the earth may become too hot to live on.” As for me, I think we should ___________to solve the problem.
人教版Book3 Unit4 How life began on the earth
A
B Байду номын сангаас D
1E
F
H
I
J
1E
2J
3F
4A
5I
8G 9C
7B
6H
10D
II. Thinking & inquiring
1. Summarize a heading for each paragraph
Para. 1 Para. 2 Para. 3 Para. 4 Para. 5
the origin/formation of the universe the origin/formation of the earth the importance of water for life the development of life on the earth humans’ influence on the earth
Shorten the text to present the main idea in around 100 words after class.
made the atmosphere
cooled down
water appeared
2.2 Try to sort out the lower words of life based on Para. 4 and 5.
3. What is the real intention of the author’s writing?
2.1 Look for facts about the development of the earth in para. 2 dust settled into a solid globe
became violent
(完整版)howlifebeganontheearth文本
ReadingTitle: ____________________________1. No one knows exactly how theearth began, as it happened so long ago.However, according to a widelyaccepted theory, the universe beganwith a "Big Bang" that threw matter inall directions.After that, atoms beganto form and combine to create stars andother bodies.2. 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 whenthe 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 toproduce carbon, nitrogen, water vapourand other gases, which were to make theearth's atmosphere. What is even moreimportant is that as the earth cooleddown, water began to appear on itssurface.3. Water had also appeared on otherplanets like Mars but, unlike the earth, ithad disappeared later. It was notimmediately obvious that water was tobe fundamental to the development oflife. What many scientists believe is thatthe continued presence of water allowedthe earth to dissolve harmful gases andacids into the oceans and seas. Thisproduced a chain reaction, which madeit possible for life to develop.4. Many millions of years later, thefirst extremely small plants began toappear on the surface of the water. Theymultiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insects. Others, called amphibians, were able to live on land as well as in the water. Later when the plants grew into forests, reptiles appeared for the first time. They produced young enerally by laying eggs. After that, some huge animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years. However,65 million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remains a mystery. This disappearance made possible the rise of mammals on the earth. These animals were different from all life forms in the past, because they gave birth to young baby animals and produced milk to feed them.5. Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the earth. Thus they have, in their turn, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.。
M3U4ReadingHowlifebeganontheearth文本理解及教学设
M3U4 Reading How life began on the earth文本理解及教学设计邵志凌温州市第十五中一、设计指导思想：“学生是教学的本体，一切教育活动应为这个本体服务”。
本节课教学设计践行“学为中心”的教改理念。
学生的学要基于生本，即教师要根据学生的智力水平、兴趣爱好的具体情况，整合授课内容，激发学生主动、积极参与课堂的主动性。
此外，学生的学要激活文本，具体表现在教师根据学习内容的特点，通过一定的途径对学习者进行学习方法的传授、诱导，使学习者掌握科学方法，并灵活运用于学习。
二、教材分析：本课例“How life began on the earth”选自SEFC BOOK3 Unit 4中Reading部分。
前三段通过列举时间、数字和运用从句说明地球的形成，第四段用多样的时间副词讲述生命的起源与繁衍的简单过程，最后一段提出人类出现后给地球带来的问题。
从模块设计的目的以及学习活动和训练的侧重点来看，这一板块是将整个单元主题相关的语言知识采用相对集中的输入，重在训练学生的阅读能力，兼顾听说，并包括词汇、语法学习活动，最后能对文本所承载的内容和情感加以输出。
作为一篇典型的科普说明文，它以时间为顺序的框架一目了然，生命从非生物到生物，从水生到陆生，从卵生到胎生的进化过程十分清晰。
时间线的使用使得语篇中出现了大量的表示时间先后的词语和句子，如：First, next, later, after that, for several billion years after…, in time等等，它们使文本对生命起源的介绍有序、清楚。
从说明语言看，各种从句，如用“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”和“They were in time to produce carbon dioxide, nitrogen, water vapor and other gases, which were to make the earth’s atmosphere.”等使文本介绍生命起源所需的物质基础的过程显得非常精确、不繁琐。
Unit_4 二 How life began on the earth
10. …the earth may become too
hot to live on.
地球可能会因此变得太热而不适
合生物的生存。
有关too的一些用法
1) too作 “太” 讲。 There is too much water.水太多了。 This shirt is too large for me. 这衬衫我穿起来太大。 The problem is rather too hard for me. 这个问题对我来说太难了。
1). No one can prevent the plans ___ out. A. to be carried B. from carrying C. not to carry D. from being carried 2). They tried to prevent the plane from ___ on the runway. A. land B. landing C. to land D. being landed
come will depend on whether
this problem can be solved. 在未来的千百万年中,生命能否在 地球一延续将取决于这个问题能否 得到解决。
depend vi. 相信,信赖;依靠,依赖
(尤指钱); 视……而定
① You can depend on John —
Paragraph 4
The arrival of humans and their impact on the earth.
9. They are putting too much carbon
dioxide into the atmosphere, which
unit4-how-life-began-on-the-earth讲课讲稿
• 他们把过多的二氧化碳释放到大气层 中，这使得地球上的热量不能释放到 太空中去。
• 因此
• 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。
作文
• 你有一个在美国的笔友名叫Tom. 他对中国 的清明节(The Qingming Festival)很感兴趣。 清明节刚刚过去，他很想知道你是如何度 过的。就此写封信告诉他。
• 地球猛烈的爆炸喷出了烈火与岩石。
• 最终产生了碳、氮气、水气和其他多 种气体，从而形成了地球的大气层。
• 更为重要的是，地球冷却下来，地球 的表面就开始出现了水。
• Paragraph three
• 在类似于火星的其他行星上都出现了 水，但和地球不同的是，这些水后来 都消失了。
• 水会对生命的发展起关键的作用，这 一点在当时一点也不明显。
• 内容要求：（字数不少于80词）
• 1、有关清明节的简单介绍。（时间和目的）
• 2、谈谈你在清明节期间做的事情。
• 3、邀请Tom来中国和你一起过下一个清明 节
此课件下载可自行编辑修改，仅供参考！ 感谢您的支持，我们努力做得更好！谢谢
• 然而，六千五百万年前，恐龙时代结 束了。
• 它们为什么会突然灭绝至今仍是个谜。
• 恐龙的灭绝使地球上哺乳动物的增多 有了可能。
• 哺乳动物不同于以往所有的生物形式， 因为它们能从体内生产出幼仔并给幼 仔哺乳。
• Paragraph five
• 最后，大约260万年前，一些小巧聪明、 长着手脚的动物出现了，它们散布在 地球的各个地方。
unit4-how-life-began-onthe-earth
• Paragraph two
人教版高中英语必修三第四单元How Life Began On The Earth-课件 30页PPT文档
As a student, what little things can we do for the earth?
Suggested Answers: control the population Plant more trees Stop littering Develop clean energy Go to work by bus rather than by
2. What made up(构成) the earth’s atmosphere after the earth exploded? Carbon dioxide, nitrogen, water vapour and other gases.
3. Why is water so important for the beginning of life? Because water allowed the earth to dissolve harmful gases and acids into oceans and seas.
• Good morning/afternoon, I am Dr…. I’m greatly honored to be here to give you a speech about the development of li
Summary
How life began on the earth “Big Bang”
Linkin Park — What I've done
What will happen when we put too much CO2 into the atmosphere? greenhouse effect global warming
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 .
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How life began on the earth
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.
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 vapor and other gases, which were to make the earth’s atmosphere. What is even mo re important is that as the earth cooled down, water began to appear on its surface.
Water had also appeared on other planets like Mars but unlike the earth, it had disappeared later. It was not immediately obvious that water was to be fundamental to the development of life. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas. This produced a chain reaction, which made it possible for life to develop.
Many millions of years later, the first extremely small plants began to appear on the surface of the water. They multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insects. Others, called amphibians, were able to live on land as well as in the water. Later when the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. After that, some huge animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years. However, 65 million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remains a mystery. This disappearance made possible the rise of mammals on the earth. These animals were different from all life forms in the past, because they gave birth to young baby animals and produced milk to feed them. Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the earth. Thus they have, in their turn, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.。