1、Teaching Design 教学设计 HOW LIFE BEGAN ON THE EARTHIntroductionIn this period, after the warming up, students will first be guided to talk and share. Then they will be helped to read an exposition（说明文）entitled HOW LIFE BEGAN ON THE EARTH. Then the students may be asked to listen and read aloud，read and
2、 underline，read and understand difficult sentences，read and transfer information，read and translate, read to decide on the type of writing and summary of the text and finally read to draw a tree diagram of the text and retell the story with the help of the diagram. The period will end in students ha
3、ving a discussionHow Did the Universe Begin? ObjectivesTo help students understand the texts forms and contents and learn about festival Astronomy To help students communicate on the topic in focus with the words, expressions and structures learned in this unitFocusWordsdissolve， exist，puzzle，crash，
4、pull，float，exhaustExpressionsin time, lay eggs, give birth to, block out, cheer up, now that, break out, watch outPatterns1. It exploded loudly with fire and rock, which were in time to produce the water vapor, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earths atmospher
5、e. 2. Nobody knew that it was going to be different from other planets going round the sun. 3. It allowed the earth to dissolve harmful gases, which had become part of the earths atmosphere, into the oceans and seas. 4. This encouraged the development of early shellfish and all sorts of fish. 5. The
6、y produced young generally by laying eggs. 6. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 7. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. Aids Mu
7、ltimedia facilities, tape-recorder, photos, diagramsProceduresI. Warming up by learning vocabularyGood morning, class! Today, we are going to take Unit 4 Astronomy: the science of the stars. Before we read the text, lets turn to page 99 and get familiarized with the vocabulary first. Pay attention t
8、o the making of the word. Study the prefixes, roots and suffixes in the words.II. Reading and comprehending1. Looking and sayingHave you ever wondered how the universe began? Well Im sure you may have many answers to this question, but I have one that perhaps, you may not have heard of yet. I will b
9、e giving you my theory on this subject. Now look at the screen and listen to me telling you something exciting.科学家透露：宇宙可能有两个我们的宇宙和一个隐藏的宇宙共同镶嵌在五维空间中。在我们的宇宙早期，这两个宇宙发生了一次相撞事故，相撞产生的能量生成了我们宇宙中的物质和能量。 2. Talking and sharingDo you know how the universe began?In the 1920s in California, astronomer Edwin Hub
10、ble observed distant galaxies using an extremely powerful telescope. He made two mind-boggling (unbelievable) discoveries. First, Hubble figured out that the Milky Way isnt the only galaxy. He realized that faint, cloud-like objects in the night sky are actually other galaxies far, far away. The Mil
11、ky Way is just one of billions of galaxies. Second, Hubble discovered that the galaxies are constantly moving away from each other. In other words, the universe is expanding. The biggest thing that we know about is getting bigger all the time. A few years later, Belgian astronomer Georges Lematre us
12、ed Hubbles amazing discoveries to suggest an answer to a big astronomy question: “How did the universe begin?” 3Listening and reading aloudNow please listen to the recording and then read the text aloud. Pay attention to how the native speaker is reading along and where the pauses are within each se
13、ntence. I will play the tape twice and you shall read aloud twice, too.4 Reading and underliningNext you are to read and underline all the useful expressions or collocations in the passage. Copy them into your notebook after class as homework.Collocations from HOW LIFE BEGAN ON THE EARTHa cloud of e
14、nergetic dust（具有能量的尘埃）, combine into（合成）, move around the sun（环绕太阳运转）, become violent（变得激烈）, the solid surface（固体表面）, explode loudly（猛烈爆炸）, in time（及时，最终）, produce the water vapor（产生水蒸汽）, make the earths atmosphere（构成了地球的大气层）, cool down（冷却）, on the surface（在表面）, be different from（与不同）, go round the
15、sun（环绕太阳运转）, disappear from（从消失）, stay on（存留在）, show ones quality（显现某人的特性）, dissolve harmful gases（分解，溶解有害气体）, become part of（变成的一部分）, develop life（发展生命）, grow in the water（在水里生长）, fill with（用来填充，充满了）, encourage the development of（鼓励的发展）, millions of years later（几万年以后）, live on land（在陆地上生活）, live in
16、 the sea（在海里生存）, grow into forests（长成森林）, produce young（生出幼仔）, lay eggs（下蛋）, animals with hands and feet（长着手脚的动物）, spread all over the earth（遍布全世界）, develop new methods（发展了新的方法）, grow food（种植）, move around（迁徙）, go by（过去，推移）, take care of（在意，照看好）, putinto（把带入，放入）, preventfrom（防止做）, escape from into（从
17、逃离到）, become hot（变热）, depend on.（依靠，依赖，取决与）, solve a problem（解决一个问题）3. Reading and understanding difficult sentences Skim the text and identify the difficult sentences of each paragraph. You may put your hand up if you have any questions. 4. Reading and transferring informationRead the text again to
18、 complete the table below, HOW LIFE BEGAN ON THE EARTHWhat was the earth like after the “Big Bang”?Why was the earth different?How was life developed on earth?What did small clever animals do? HOW LIFE BEGAN ON THE EARTHWhat was the earth like after the “Big Bang”?A cloud of energetic dust at first
19、and then a ball around the sun. In time as a result of its explosion, water vapor and many other gases were produced to make the earths atmosphere. Water then appeared when it cooled down, offering the possibility for the beginning of life.Why was the earth different?The arrival of small plants grow
20、ing in the water filled the oceans and seas with oxygen, encouraging the development of small living things.How was life developed on earth?Carbon dioxide and air with oxygen helped life developed. First were insects and amphibians, and then appeared reptiles and dinosaurs, producing young by laying
21、 eggs. At first, came mammals producing young from within their bodies.What did small clever animals do? With hands and feet, they spread all over the earth, developing new methods of growing food, hunting and moving around, yet neglecting the environment protection, causing new problems for human b
22、eings existence for good.5. Reading the text once again to decide on the type of writing and summary of the textType of writingThis is a descriptive writing.Main idea of the passageThe earth came into being after the “Big Bang”. Then small plants came growing in the water, followed by green plants a
23、ppearing on land. In the end appeared small clever animals.Topic sentence of 1st paragraphAfter the “Big Bang”, the earth was just a cloud of energetic dust.Topic sentence of 2nd paragraphThe earth was different because of the arrival of small plants growing in the water.Topic sentence of 3rd paragr
24、aphMany millions of years later the first green plants began to appear on land.Topic sentence of 4th paragraphSmall clever animals appeared and spread all over the earth.III. Homework1. Finish Exx 1 4 on Page 27 in the SB.2. Finish Ex1 in Parts 1 2 on Page 3 in the Learning English (25th).3. Finish Ex1 on Page 45 in the Best English.
