《Astronomy: the science of the stars》ppt59（3份）

共38张。课件内容充实，课件制作精美，新课引入新颖、生动形象。知识点讲解条理清晰，适合新课教学使用。

人教版高中英语Boonit 4 Astronomy the science of the stars 教案+课件（38张）+检测 （3份打包）
　　【教学设计】_Unit4Astronomythescienceofthestars_英语.doc
　　【教学课件】_Unit4Astronomythescienceofthestars_英语.ppt
　　【评测练习】_Unit4Astronomythescienceofthestars_英语.doc
　　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 wort 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. Wort 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.    
　　3. Thint the relationships between plants and animals and fill in the chart?
　　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