必修三unit4reading导学案(3页).doc

-必修三unit4reading导学案-第 3 页【学习目标】：1. To learn some useful words and expressions in the text. 2. To learn the development of life. 3. To improve some reading skills, and learn the organization of the text. 4.Train Ss interests in science and stimulate their love for astronomy.【教学重点】：1. Get the Ss to know the development of life.2. To improve the students reading ability.【预习案】一、Warming-up: discuss with your partner, and answer the following questions.1. How many planets are there in our solar system? What are they?_2. Why is the earth the only one of all the plants on which life can survive?_3. Do you know where are we come from? Who are our ancestors?_二、Skimming1. Look at the title of this passage, can you predict what the passage will be about?2. Write down the topic sentence of each paragraph.Paragraph 1:_Paragraph 2:_Paragraph 3:_Paragraph 4:_Paragraph 5:_3. The text can be divided into three parts, fill in the blankets below.Part 1(para_): _ made it possible for life begin to develop.Part 2(para_-para_): The _ of life.Part 3(para_): The development of _.【探究案】一、Detailed readingSlowly combineA violent _ ball1. Read para1-2, compete the following chart._ dustBig BangA cloud of dust Make the earths _Produce _ and _ with fire and rock2. Read part 2 and put the order of development of life into a timeline according to the text.1. Insects and amphibians appeared. 2. Dinosaurs appeared.3. The earth became a solid ball. 4. Small plants grew on dry land.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.The right order is _.二、Post-reading：think about what you have read and discuss these questions in pairs.1. Why is it wrong to show films with dinosaurs and people together?2. Why is the earth different from the other planets?3. Why did plants grow before the animals came?4. What problem is caused by human beings?5. As a student, what little things can we do for the earth?三、Some difficult sentences in the text.1. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.句子翻译：_这是一个主从复合句，when在此引导_。主句中还包括一个what引导的_,what 在从句中做become的_。2. 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.句子翻译：_本句中包含了两个从句。一个是what引导的_, what在从句中做_ ; 另一个是that引导的_, that只起连接作用，不充当句子成分。【训练案】一、 Translate the following words and phrases.系统；体系_ 宗教；宗教信仰_ 展开；传播_学说；理论_ 猛烈的；激烈的_ 不像；与不同_存在；生存_ 迷；难题_ 因此；于是_及时；终于_ 产生；分娩_下蛋_ 轮到某人_阻止；制止_ 以开始_二、 Summary After the _,the earth was a cloud of_. Later the dust began to_ into_. And then it _ loudly with fire and rock, which were in time to _ the water vapour, carbon dioxide, which were to make the earths _.As the earth _ down,_ began to _ on its surface. Water had _ from planets or satellites, but it _on the earth. That made it possible for life to begin to _. The arrival of _ encouraged the _of early _. Many millions of years later _ began to appear_. Later _ appeared. Some were_. Others called _,were able to live on lands well as _. When the plants grew into forests, _appeared for the first time. After they disappeared,_became more important. They were the last group of animals different from because they _from within their bodies.