教学设计
Learning Objectives (学习目标)
1. To get the key information and the details of the text.
2. To learn about the development of the earth and life on the earth.
3. To learn to use important words, expressions and sentences in the text.
4. To be able to talk or write using the expressions and information from the text.
5. To raise the awareness of protecting the earth.
Step 1 Leading-in
By doing a small quiz:
(1). What’s the Earth’s true shape? Sphere(球体) Flat Oblate spheroid (扁球形体)
(2). Roughly how old is the Earth? 6,000 years 4.54 million years 4.54 billion years
(3). Is Earth the largest planet in our Solar System? Yes / No
(4). Is the Earth the only planet in our Solar System with liquid water? Yes / No
(5). Earth's atmosphere is mostly _______? Oxygen or Nitrogen
(6). What percentage of the Earth does the oceans cover? 70% or 50%
（设计意图：通过对地球知识的小测验，唤醒学生已有知识，拉近和生活的距离，让学生一开始就能融入课堂。）
Step 2 Fast Reading (Read silently and quickly for key information)
Skim over the text and work out the main idea of each paragraph:
Par. 1 The formation (形成) of the _________.
Par. 2 The formation of the _________.
Par. 3 The presence of _____ and its importance for life on the earth..
Par. 4 The development of _____ and _______.
Par. 5 _____ and their effects on the earth.
（设计意图：引入课堂以后，首先应该让学生对文章有一个整体的把握。通过了解每段的大意，总结出文章的大意。通过此步骤，将文章分成两部分，文章前三段分别讲了宇宙的形成、地球的形成和水在地球上的出现，这三者都是为生命的发展提供了物质基础；最后两段讲述了从水生植物到森林，从水生动物到人类的演变，是生命的起源和发展的过程。因此将文章分成此两部分，有助于学生的阅读和理解。）
Step 3 Detailed Reading (Read carefully to find out detailed information)
Read Part I ( par. 1 to par. 3) The development of the earth (The basis for life)
1. Work out the following chart.
matter explode
atoms fire/rock
other gases
dissolve ___________ and ________ into the oceans and seas
making it possible for ___ to develop
（设计意图：本部分讲了宇宙的形成、地球的形成和水在地球上的出现，将此过程简化成图标，既直观形象，又便于学生理解。）
Read Part II (par. 4 to par. 5): The development of life
2. Put the following events in order (The time-line of life on the earth).
Water appeared on the earth.
Insects and amphibians appeared.
Reptiles appeared.
Shellfish and other fish appeared.
Dinosaurs appeared.
Small plants grew on the water.
Plants began to grow on dry land.
Mammals appeared.
Clever animals with hands and feet appeared.
Think about the relationships between plants and animals and fill in the chart?
（设计意图：本部分讲生命的发展过程，因为在这个过程中事件是相继发生，因此让学生给这些事件排序，帮助他们理解。而后让他们理顺这些事件之间的关系，尤其是植物和森林对生命发展的作用，为下面的讨论做好铺垫。）
Step 4 Group Work: Discussion for further understanding
Working in groups, discuss the following questions and give answers: (your answers are not necessarily limited to the text. Use your knowledge and imagination)
1. Why is water important for the development of life on the earth?
2. What role do you think plants (water plants, land plants and forests) play in the development of life?
3. What are the problems (caused by human beings) that life on the earth is facing?
Why? And how do you think we can solve the problems?
（设计意图：有上面学习可知，水、植物（森林）对生命的发展起到了重要的作用，那么他们到底起了什么作用呢？而且水、森林和我们人类现在所面临的问题又是什么呢？由此，引导学生进行讨论，并进行展示，为最后的情感目标的生成最好准备。）
Step 5 Summary
（设计意图：最后，课堂小结部分还是用地球所面临的问题而结束，由此呼吁学生，形成保护地球的意识，为我们更好地生存和生活环境而付出自己的一份力量。）
Assignment (Homework):
How life began on the earth is one of the biggest puzzles that scientists found hard to solve. What other puzzles are hidden in the passage? In groups, find them out and do some research. Then each group should present a report of your research.
(Try using as many words and expressions as possible that we learned today.)
（设计意图：更深入理解课文，并利用所学，练习信息输出，培养学生的书面表达能力。）
课件38张PPT。Unit 4 Astronomy: the sceince of starsQuiz(2). Roughly how old is Earth?
A. 6,000 years B. 4.54 million years C. 4.54 billion years
(3). Is Earth the largest planet in our Solar System?
Yes / No (1). What's Earth's true shape?
A. Sphere(球体) B. Flat C. Oblate spheroid (扁球形体) (4). Is the Earth the only planet in our Solar System
with liquid water?
Yes / No
(5). Earth's atmosphere is mostly _______?
Oxygen (氧气) or Nitrogen (氮气)
(6). The oceans cover what percentage of the Earth?
70% or 50%the earthmysteriesHow did the earth come into being?PanguGodscientific theorybeliefs or religionsHow life began on the earthStep 2 Fast reading 1. Skim over the text and work out:Par. 1 The formation (形成) of the _________..
Par. 2 The formation of the _________.
Par. 3 The presence of _______ and its importance for life on the earth.
Par. 4 The development of ________ and _________.
Par. 5 ______________ and their effects on the earth.Read silently and quickly for key information3’universeearthwaterplantsanimalsHuman beings
a cloud of dust
atmosphere/air
dissolve ___________ and ________ into the oceans and seasmaking it possible for ___ to developexplodefire/rockmatteratomsStep 3 Detailed reading Read Part I ( par. 1 to par. 3) The development of the earth(The basis for life)1. Work out the following chart.4’Step 3 Detailed reading
matteratomsBig Banga cloud of dust1. Work out the following chart.
atmasphere
explodefire / rocksatmospheresolid globecarbonnitrogenwater vapourother gasescool down dissolve ________________ and _______ into the oceans and seasmaking it possible for _____ to develop harmful gasesacidslifewaterBig Banga cloud of dustatmospheresolid globeexplodewaterRead Part II (par. 4 to par. 5): The development of life 2. Put the following events in order
(The time-line of life on the earth).
3. Think about the relationships between plants and animals
and fill in the chart?6’Step 3 Detailed reading Step 3 Detailed reading 2. Put the following events in order Water appeared on the earth.1. 6. 7. 8. 9. Clever animals with hands and feet appeared. Mammals appeared.Plants began to grow on dry land.Small plants grew on the water.Dinosaurs appeared.Shellfish and other fish appeared.Reptiles appeared.Insects and amphibians appeared.5. 3. 2. 4. human beingsStep 3 Detailed reading 3. relationships between plants and animalssmall plants in water
shell fishall sorts of fishinsectsamphibiansreptilesdinosaursmammals
plants on landforests
human beingsthe cleverest animals ——human beingsfor life developmet on the earthwater plants forestsStep 4 Group Work: Discussion Working in groups, discuss the following questions
(your answers are not necessarily limited to the text. Use your knowledge and imagination. You can wrrite or draw pictures):
1. Why is water important for the development of life on the earth?
2. What role do you think plants (water plants, land plants and even forests) play in the development of life?
3. What are the problems (caused by human beings) that life on the earth is facing?
Why? And how do you think we can solve the problems? 7 minsSummaryThe universe began with a _______. Then the earth become a ________, which exploded with ________, which in time to produce the earth's ___________. As the earth cooled down, _____ began to appear, which dissolve ____________ and _____ into the oceans and seas.big bangsolid globefire and rocksatmospherewaterharmful gasesacids____________ on water surface filled the oean with oxygen, encouraging life as ________ and _________. __________ on land were followed by ________ and __________. When pants grew into forests, _______ appeared, followed by ________, ________, and finally __________, who caused a serious problem to the earth. Whether the problem can be solved matters a lot for the earth in years to come.SummarySmall plantsshellfishall sorts of fishGreen plantsinsectsreptilesamphibiansdinosaursmammalshuman beingsbig banga could of dusta solid globeexplode with
fire and rockatmosphereplants on
water surfacewaterSummaryshellfish
and fishesplants on landinsects
amphibiansforestsreptilesdinosaurshuman
beingsmamalsSummarySummaryWe have only one EARTH ! Assignment (Homework):How life began on the earth is one of the biggest puzzles that scientists found hard to solve. What other puzzles are hidden in the passage? In groups, find them out and do some research. Then each group should present a report of your research.
(Try using as many words and expressions as possible that we learned today.)Thank you for your attention and cooperation! Step 4 Group Work: Discussion 1. Why is water important for the development of life on the earth?Dissolve harmful gases and acid,
allow water plants to grow, which fill water and atmosphere
with oxygenStep 4 Group Work: Discussion 2. What role do you think plants (water plants, land plants and even forests) play in the development of life?Food,
food chain,
living environment,
oxygen,
materials for lifeStep 4 Group Work: Discussion 3. What is the problem (caused by human beings) that life on the earth is facing?
Why? And how do you think we can solve the problem? We put too much dioxide into the atmosphere,
earth is becoming too hot to live on,
We pollute the water, rovers and seas and oceans,
We destroy the forest,
Water shortage评测练习
1. 根据课文内容，将下列文章补充完整。
The universe began with a _______. Then the earth become a ________, which exploded with ________, which in time to produce the earth's ___________. As the earth cooled down, _____ began to appear, which dissolve ____________ and _____ into the oceans and seas.
____________ on water surface filled the oean with oxygen, encouraging life as ________ and _________. __________ on land were followed by ________ and __________. When pants grew into forests, _______ appeared, followed by ________, ________, and finally __________, who caused a serious problem to the earth. Whether the problem can be solved matters a lot for the earth in years to come.
2. 列出地球形成和生命发展的时间线。
Big bang Human beings
