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1、 Para. 1(L.2) the universe began with a “Big Bang” that threw matter in all directions.(L.3) After that, atoms began to form and combine to create stars and other bodies. Para. 2(L.7) until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.(L.14) Water began to appear on
2、 its surface. Para.3(L.21) 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. Para.4(L.35) Some were insects. Others, called amphibians, were able to live on land as well as in the water.Unit 4Unit 4 As
3、tronomy: Astronomy: the science of the the science of the starsstars(Reading) (Reading) Where do we come from? Who are our ancestors? Are they true for the beginning of the life?Do you know what a scientific idea is?_ separatedthe sky from the earth._ created humans._ createdthe world PanguNvwaGod盘古
4、开天盘古开天女娲造人女娲造人上帝创世说上帝创世说Solar systemHow many planets are there in the solar system? Is there life on other planets? Why?How Life Began on the EarthHowlife began?on the earthWords and expressions: universe (n.) 宇宙宇宙 violent (adj.) 猛烈的猛烈的 (n.) violence solid (adj.) 实心的，固体的实心的，固体的 (a golbe) explode (vt
5、. & vi.) 爆炸，爆发爆炸，爆发 (n.) explosion in time 及时及时 eventually 最终最终 carbon dioxide (CO2) 二氧化碳二氧化碳 oxygen (n.) 氧氧 nitrogen (n.) 氮氮 water vapor 水蒸气水蒸气 atmosphere (n.) 大气层；气氛大气层；气氛 dissolve (v.) 溶解溶解 harmful (adj.) 有害的有害的 (vt. & n.) harm multiply (v.) 繁殖繁殖 shellfish (n.) 水生有壳动物水生有壳动物 amphibian (n.) 两栖动物两栖动
6、物 reptile (n.) 爬行动物，爬虫爬行动物，爬虫 mammal (n.) 哺乳动物哺乳动物 exist (vi.) 存在，生存存在，生存 (u.n.) existence appear (vi.) 出现出现 反义词：反义词：disappear spread (vt. & vi.) (spread, spread) 伸展，展开，传播伸展，展开，传播 prevent.from = stopfrom 使使不做事；阻止不做事；阻止做某事做某事 depend on 视某事物而定；取决于某事物视某事物而定；取决于某事物 Read the passage as listening to the t
7、ape, and then answer the following questions. Questions: How did the universe begin according to a widely accepted theory? (para.1)2. What was produced when the earth exploded? (para.2)3. Why is water important on the earth? (para.3)4. Which kind of life-being first appeared on the earth, plants or
8、animals? Why? (para.4)5. Why were mammals different from other life forms? (para.4)6. Whats the problem with the earth now? (para.5) How did the universe begin according to a widely accepted theory?（Para.1） The universe began with a Big Bang.2. What was produced when the earth exploded? （Para.2） Car
9、bon, nitrogen, water vapor and other gases.3. Why is water important on the earth? (Para.3) It allowed the earth to dissolve harmful gases and acids into the oceans and seas.4. Which kind of life-being first appeared on the earth, plants or animals? Why?（Para.4） At first, small plants began to appea
10、r on the surface of the water, they produce oxygen, which encouraged the later development of early shellfish and all sorts of fish.5. Why were mammals different from other life forms? （Para.4） Because they gave birth to young baby animals and produced milk to feed them. 6. Whats the problem with th
11、e earth now? （Para.5） The earth may become too hot to live on. Read the passage again and put the order of development of life into a timeline according to the reading passage. （Exercise 2 on Page 27）1. Insects and amphibians appeared.2. Dinosaurs appeared. 3. The earth became a solid ball.4. Small
12、plants grew on the water.5. Reptiles appeared.6. Plants began to grow on dry land.7. The earth was a cloud of dust.8. Water appeared on the earth.9. Shellfish and other fish appeared.10. The universe began with a “big bang”.11. Clever animals with hands and feet appeared 12. Mammals appeared. Lets r
13、eview the development of life.Big Bang（大爆炸）（大爆炸）Atoms (原子原子)Para.1 Universe began with _?_a cloud of dust A solid globeThe earths atmosphereWaterPara.2 the earth was still _: fundamental to the development of lifePara.3WaterSmall plants on the surface of the waterEarly shellfish and all sorts of fis
14、hGreen plants on landPara.4Land animalsReptiles Huge animals (Dinosaurs) The rise of mammals Clever animals with hands and feet(Human beings) Para.51. Insects and amphibians appeared.2. Dinosaurs appeared. 3. The earth became a solid ball.4. Small plants grew on the water.5. Reptiles appeared.6. Pla
15、nts began to grow on dry land.7. The earth was a cloud of dust.8. Water appeared on the earth.9. Shellfish and other fish appeared.10. The universe began with a “big bang”.11. Clever animals with hands and feet appeared 12. Mammals appeared.615210738412 911 Base on the above exercises and analyze th
16、e structure of the text. Write down the main idea for each paragraph. (Exercise 1 on Page 27)Para 1: Para 2:Para 3:Para 4: Para 5: A widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of plants and animals on the ear
17、th.The arrival of humans and their impact on the earth. Lead-inDevelopment of lifeEndingMain Body We have only one earth!We should take care of the earth!ks5u精品课件As a high school student, what little things can we do for the earth? ride bikes or take a bus or walk to school plant treessave waterWhat
18、 can we do for taking care of the earth?Possible answers:save electricity join Earth houruse recyclable products save paper reduce rubbish Only if we understand can we care; Only if we care will we help; Only if we help shall all be saved. Jane Goodall唯有了解，我们才会关心唯有了解，我们才会关心 ；唯有关心，我们才会行动；唯有关心，我们才会行动；唯有行动，生命才会有希望。唯有行动，生命才会有希望。 珍妮珍妮古道尔古道尔Homework1. Review the important words & phrases of the reading text2. Do related exercise of the exercise book3. Underline what you dont understand in the textWe are making the world better.We are making the world worse.ABDiscussion