How life began on the earth
Learning Objectives(学习目标)：
To understand how our universe, the earth and life began.
理解我们的宇宙、地球和生命是如何开始的。
To practise fast reading for structure (结构)and careful reading for details（细节）.
锻炼快速阅读和细节阅读的技能。
To learn to work together within a team to solve difficult problems.
学习合作学习共同解决困难的能力。
To heighten （提高）our awareness （意识）of protecting the earth and nature in order to
build a harmonious nature. 提高我们环境保护、建设和谐自然的意识。
Task 1: Listen and pay attention to the meaning of underlined words.
How life began on the earth
According to Stephen Hawking, our universe began with a Big Bang (大爆炸)which threw matter (物质)in all directions. Then atoms (原子)formed and combined to make stars, bodies and planets.
The earth, one of the planets in the universe was a cloud of dust in the beginning. It was violent, exploding with fire and rock, which produced carbon(碳), nitrogen(氮), water vapor (水蒸气)and other gases to form the atmosphere of the earth. Later, the earth settled and cooled down into a solid globe, and water began to appear on its surface.
Water was fundamental to the development of life on the earth. With the appearance of water, small plants began to appear in the ocean. Then there appeared green plants on land and shellfish(水生贝壳类生物) in the sea. Coming next were amphibians (两栖动物)which could live both on land and in the water. As time went by, reptiles(爬行动物) showed up, one of which were dinosaurs. After the dying out of dinosaurs, mammals (哺乳动物)came to the stage, of which human beings are the advanced. However, humans put too much carbon dioxide into our space, and our earth is becoming hotter and hotter, can you imagine the future of the earth?
New words:
universe ['ju:niv?:s]
in all directions
bodies and planets ['pl?n?t]
a cloud of dust
violent ['va??l?nt]
explode [?k'spl??d]
gas [g?s]
atmosphere ['?tm?sf??]
cool down
a solid ['s?l?d] globe
surface['s??f?s]
fundamental [f?nd?'ment(?)l]
dinosaur
carbon ['kɑ：b(?)n] dioxide [da?'?ksa?d]n.二氧化碳
Big Bang 大爆炸
matter n.物质
atoms['?t?m] n.原子
carbon n.碳
nitrogen n.氮
water vapor[?ve?p?r]n.水蒸气
shellfish n.水生贝壳类生物
amphibian[?m'f?b??n]n.两栖动物
reptile['repta?l] n.爬行动物
mammal ['m?ml] n.哺乳动物
Task 2: Get to know the main idea of each paragraph and fill in the blanks with
proper words.
Para.1: The beginning of our ____________.
Para.2: The beginning of our ____________.
Para.3: The importance of ____________.
Para.4: The beginning of ____________ on our earth.
Para.5: The beginning of___________ and their_______ on the earth.
Task 3: Label(贴标签) the names and know how life began on the earth.
Task 4: Describe(描述) the labelled names with details(细节).
Task 5: Give an oral report（口头报告） on how life began on the earth.
?(The universe began with...
In the beginning, the earth was just...later,...
(the atmosphere/ water)
? (Millions of years later, small plants..., which...
? (Then, green plants appeared on land, and in water....
④When green plants formed forests, there came amphibians which...
and later reptiles that...
⑤After the disappearance of dinosaurs, mammals came to rise(产生) which...
Task 6: Discuss the following questions.
1. What is humans’ influence(影响) on the earth?
2. Can you think of other problems humans caused to the environment?
Task 7: Assignment(作业):
Pick one from two assignments(二选一)
1.Write a report on how life began on the earth?
2.Do a class report on what humans have done to the earth and the future of the earth.
Task 8: Self-assessment(自我评价)
Think what you have read and practised in this class. Then tick the boxes.
I have learned I need to learn more
this well
I have learned about:
§some scientific knowledge about the universe,
the earth and different lives on the earth 口 口
§How life began on the earth 口 口
§some new words and expressions
appeared in the passage 口 口
§How to work together within a group
to solve difficult problems. 口 口
§What we should do to protect the earth 口 口
Task 9: Extended reading(课外拓展阅读)
We certainly know that our universe exists, but this knowledge alone has not satisfied human’s long search for further understanding. Our curiosity has led us to question our place in this universe and even the place of the universe itself. Throughout (贯穿) time we have asked ourselves these questions: How did our universe begin? How old is our universe? How did matter come to exist? Obviously, these are not simple questions. Throughout our brief history on this planet much time and effort has been spent looking for some clue (线索). Yet, after all this energy has been used up, much of what we know is still only speculation (推测).
However, we have come a long way from the beginnings of the study of cosmology and the origins of the universe. Through the understandings of modern science, we have been able to provide firm theories for some of the answers that we once called speculation. True to the nature of science, most of these answers have only led to more interesting and complex (复杂的) questions.
It will be impossible to deal with all of the questions about the creation of everything that we know as reality in this short passage, but an attempt will be made to deal with certain basic questions of our being. It will be important to keep in mind that all of this information is often being questioned and reevaluated (再评估) in order to understand the universe more clearly. For our purposes, through an examination of what is known about the Big Bang itself and the age of the universe, we believe that we can begin to answer several of these key questions.
课堂教学设计具体说明
步骤
教师活动
学生活动
设计目的
评价形式和练习
课前
知识准备：收集关于宇宙大爆炸、地球的形成、生命的形式、人类对地球的影响等方面的知识； 掌握课标中对本单元词汇、功能和语法的要求等
技术准备：制作词汇
视频
准备课件
预习词汇
保证课堂上教师和学生知识的准备和课堂的顺利进行
导入
Lead-in
问题：Do you want to know how our universe, the earth and life began? 利用教学目标中的第一条导入。
回答问题
激发学生兴趣
引出单元话题“How life began on the earth”
观察学生的表情体会他们对课堂的兴趣
词汇学习
Vocabulary learning
播放用photostory制作的关于地球上生命起源的视频
观看视频
体会生词的意义
初步了宇宙和地球如何形成，生命是如何出现的。
激发兴趣，用全新的方式体验单词意义
检查学生能否回答出ppt.中单词词义（相当于单词测验）
速读
Skimming
指导速读策略
提问每段段落大意
速读
填空Fill in the blanks
训练阅读技巧skimming和学生概括段意的能力
填空练习
速读
Scanning
指导学生找出关键词
并在课文中做好标记
速读找关键词
Lebal the names of life把各种生命形式按照起源的先后顺序排序
训练学生速读找出关键词的能力
激发兴趣使得学生明白生命进化的先后顺序
找到各种labels并排序
细读
Scanning
指导细读策略，寻找关键词
指导如何对关键词进行描述
细读
描述各种生命形式
小组合作讨论
训练学生运用语言进行描述的能力
使得学生在遇到困难时后求助小组同学
启发思维，用自己的语言进行描述事物
描述以上labels中提到的各种生命形式。Describe the labelled names
巩固总结consolidation and summary
指导学生用自己的语言总结生命进化的过程
小组讨论
每个成员进行总结生命起源的某一阶段
激发学生的兴趣和参与意识
培养合作意识
总结和巩固课文内容和练习语言知识
小组中每一成员总结一段生命进程 do an oral report
升华与提高
Sublimation and improvement
引导学生思考：人类对地球的影响
小组讨论表达人类对于地球的影响
1.启发学生思考，尤其是人类对于地球所造成的问题
2.引导学生运用语言知识进行表达
3.激发学生爱护生命、保护地球的意识
口头表达和思考
作业
assignment
指导写一份书面报告：生命是如何在地球上出现的？
指导学生在班里做一份class report:报告人类对于地球所产生的影响以及地球的未来在哪里？
学生任选其一完成作业
首尾呼应话题
更好的运用所学词汇句式等语言知识
锻炼学生上网搜集信息的学习策略
强化学生书面表达的能力或者口头表达能力
书面表达
口头报告
课件14张PPT。
Unit 4 M3
How life began on the earth
（人教版普通高中课程标准实验教科书必修三第四单元） Learning Objectives(学习目标)：
1.To understand how our universe, the earth and life began.
理解我们的宇宙、地球和生命是如何开始的。
2.To practise fast reading for structure (结构)and careful reading for details（细节）.
锻炼快速阅读和细节阅读的技能。
3.To learn to work together within a team to solve difficult problems.
学习合作学习共同解决困难的能力。
4.To heighten （提高）our awareness（意识） of protecting the earth and nature in order to build a harmonious society.提高我们环境保护、建设和谐自然的意识。 New wordsuniverse ['ju:niv?:s] n.
in all directions
bodies and planets ['pl?n?t]
a cloud of dust
violent ['va??l?nt]
explode [?k'spl??d]
gas [g?s]
atmosphere ['?tm?sf??]
cool down
a solid ['s?l?d] globe
surface['s??f?s]
fundamental [f?nd?'ment(?)l]
dinosaur Know their meaningscarbon ['kɑ：b(?)n] dioxide [da?'?ksa?d]n.二氧化碳
Big Bang 大爆炸
matter n.物质
atoms['?t?m] n.原子
carbon n.碳
nitrogen n.氮
water vapor[?ve?p?r]n.水蒸气
shellfish n.水生贝壳类生物
amphibian[?m'f?b??n]n.两栖动物
reptile['repta?l] n.爬行动物
mammal ['m?ml] n.哺乳动物 Learn to read Fill in the blanksPart1(Para.1): The beginning of our ____________.
Part2(Para2-4)
Para.2: The beginning of our ____________.
Para.3: The importance of ____________.
Para.4: The beginning of __________on our earth.
Part3(Para.5): The beginning of__________ and
their__________ on the earth.universeearthwaterlifehumansinfluence Label(贴标签) the names a cloud of dust ? small plants green plants on land ? ? ? mammals a solid globe shellfish amphibians reptiles a solid globe shellfish amphibians reptiles Describe(描述) the labelled names a cloud of dust a solid globe small plants green plants on land shellfish amphibians reptiles mammals a cloud of dust: It looked like cloud, actually they are stars which are made from atoms. a solid globe: It was violent,the shape would not last, exploding with fire and rock......Aroud it there was atmosphere which includes carbon, nitrogen,water vapor and other gases, on its surface there was water.small plants: They began in the ocean. They mutiplied and filled the oceans and seas with oxygen. green plants on land: They grew on land, formed forests. shellfish: a kind of fish with shells on its back amphibians: They could live both on land and in the water. reptles: They laid eggs. Dinosaurs were one of the huge reptiles.mammals:They gave birth to young babies and produced milk to feed them. oral report(报告)Follow the patterns(句式结构) if possible:
?The universe began with....
In the beginning, the earth was just...later,...
(the atmosphere/ water)
?Millions of years later, small plants..., which...
?Then, green plants appeared on land...and in water...
④When green plants formed forests, there came amphibians which....and later reptiles ....
⑤ After the disappearance of dinosaurs mammals came to rise (产生)which......
?Big Bang?small plants?green plants/shellfish④ amphibians
reptiles⑤ mammals Discuss
What is humans’ influence(影响) on the earth?
Can you think of problems humans have caused to the environment?
Problems we have caused to the earthThe earth gave us life, what should we give back to the earth? Assignment(作业)Pick one from two assignments(二选一)
1.Write a report on how life began on the earth?
2.Do a class report on what humans have done to the earth and the future of the earth. Thank you !评测练习
对于学生的学习效果，我采用以下两种评价方式：自我评价和小组互评。
1. 自我评价
After learning this unit, I am able to do the following things...
Very well
Well
Only with the help of others
I needed to work harder
understand how our universe, the earth and life began.
work together within a team to solve difficult problems.
heighten my awareness of protecting the earth and nature in order to build a harmonious society.
Give a brief introduction to the beginning of life on the earth in my own words.
小组互评
Check to see
Assessment
Everybody participates in group activities and makes contributions to the group.
The group leader encourages each member to give his/her opinion.
Everybody listens to others carefully.
The task can be done successfully.
Every one is happy with the cooperation.
We need to improve_____________________ in group work.
