人教新课标高一英语必修三教案：Unit4Astronomy全单元

Unit 4 Astronomy: The Science of The StarsTeaching aims:1.Enable students to improve their listening skills and reading ability.2.Enable students to understand the development of gravity and how gravity affectsus in different times and places.3.Arous e students’ interest to search for the mystery of space.Emphasis:1.Words and expressions: gravity, float, cheer up, now that, break out, etc2.Astronomic knowledge like gravity and black hole.Difficulties:1.Help the students to understand the development of gravity.2.Help the students to know how gravity influences us.Teaching methods: skimming, scanning, discussing.Teaching aids: a tape recorder, a projector and a computer.Teaching procedures:Period one ReadingStep 1. Presentationoday we’ll come to Unit 4 Astronomy. Before that I have a question: Where T: Hello, everyone! Tdo we come from? Or we can say: Who are our ancestors?S1: Monkeys!S2: Beijing Ren who lived many years ago.S3: Reptiles.S4: Mammals.S5: Amphibians.S6: Dinosaurs.T: Very good! Can you put them in right order?S7: Amphibians, Reptiles, Dinosaurs, Mammals, Beijing Ren.T: Do you know what it was like before life appeared on earth?S8: It was full of water, perhaps.T: Before that, what was it like?S9: Sorry, I don’t know.T: Do y o u want to get more information? Today we’ll learn something about How Life Began the Earth. Turn to Page 25. Let’s come to Warming up first.Step 2. Warming up1. Read the three questions, while the students listen and follow.2. Give the Ss several minutes to discuss the questions.3. Collect answers from the whole class.4. Check the answers while discussing.T: I’ll read the three questions for you. You should listen to me carefully. (If students donhow to discuss, show them an example.) For example, medicine. When someone gets serious illness, he will go to the hospital. The doctor will examine him. He will take his temperature,measure h is blood pressure a nd give him an X-ray, or a CT. For the whole p rocess o f theexamination, what kind of science has been used?S1: Biology.S2: Chemistry.T: So we can say medicine c ombines biology a nd chemistry. What about biochemistry andgeophysics?S3: I think biochemistry combines biology and chemistry.S4: Geophysics combines geology and physics.T: What about astronomy?S5: Physics.S6: Mathematics.T: Very good. We should know that astronomy is a multidisciplinary subject and if we want to do some r esearch o n it, we should k now many science s ubjects r elated t o it. Now discuss t hesecond question:What d o we mean when we say we are studying a subject scientifically? Or what’s t attitude towards science?S7: We should be objective, not superstitious.T: What’s the correct way to prove a scientific idea?S8: We should design experiments to test it for several times.S9: Then we can analyze the results and draw a conclusion at last.T: Let’s sum up the answers. To study a subject scientifically, we must try to be objective. Inorder to test our idea, we should d esign e xperiments, then analyze t he results a nd draw aconclusion. Now let’s talk about the third question.What are the most important skills we need to be real scientists?S10: We should be very careful.S11: Be objective and logical.S12: We should be wise enough to design an experiment and write the reports clearly.S13: We should be able to draw conclusions from the experiments and not impose conclusionson the data.T: I think you have done great work. From the discussion we know that it’s not ea scientist. So you should work harder if you want to be a scientist.Step 3. Pre-readingGet the Ss to discuss the questions on Page 25 with their partners. Then ask the Ss to tell their stories. Encourage the Ss to tell different stories. If they don’t know any, tell the T: Now please look at the slide show. And discuss these questions with your partners. Then Iask some students to tell us their stories. Are you clear?Ss: Yes, Sir/Madam.1. Do you know each religion or culture has its own ideas about the beginning of the universe? Please give an example if you know.2. Do you know what a scientific idea is?After the Ss’ discussion, teacher says the following.T: Now who’d like to tell us a story? Volunteer!S1: Let me try. In China, we all know that Pangu separates the sky from the earth.T: Can you describe the story in details?S1: Sorry, I can’t remember clearly.T: Who can? Nobody? Now I’ll tell you. Look at the screen.Step 4. ReadingScanningSs to form aGet the Ss to read the passage quickly and accurately and meanwhile help thegood habit of reading. T eacher gives the Ss a couple o f minutes t o look through t he wholepassage. Tell the Ss to read the text silently and then ask some detailed questions about theencourage the Ss to express theirtext on the slide show with their partners. Teacher shouldideas.T: We’re going to learn a passage about how life began on the earth. Now let’s show. Read the text quickly and find answers to the following questions.Show the questions on the screen.1. What was there on the earth before life could begin?2. Why do scientists think there has never been life on the moon?3. Why did animals first appear in the seas?4. Why did green plants help life to develop?5. Why were mammals different from other animals?T: Now who can answer the first one?S1: Water vapour, carbon dioxide, oxygen, nitrogen and other gases.T: What about the second one?S2: Because there is no water on the moon.T: What about the third one?S3: Because water allowed the earth to dissolve harmful gases into the oceans and seas.T: The fourth one?S4: Because green p lants can take carbon d ioxide f rom the atmosphere and fill the air withoxygen.T: What about the last one?S5: They were different because they produced their young from within their bodies.T: Well done! Now turn to Page 26 Comprehending1, I think you may continue to read it againto get more details.SkimmingIn this part, Ss will read the text again and then finish Part1, 2 and 3.T: Now please skim the passage fast to finish Part1. Then we will check the answer.Key to Part1: BCBBT: Skim Paragraph 2, 3 and 4, and finish Part 2 and 3.Key: DBIGEHACFJT: For Part 3, discuss them with your partner.T: Why is it wrong in films and stories to show dinosaurs and people together?S: Because dinosaurs died out long before human beings developed on the earth.T: Do you agree with him?S: Yes.T: What about the answer to the second question?S: They are the cleverest animals because they have larger brains than any other creatures on the earth so far.T: Excellent job! I’ll check how much you have learned about the passage.Step 5. ListeningListen to the tape for the students to follow and have further understanding of the passage. T: Read after the tape, then answer me some questions with your book closed.Play the tapeT: How did water come into being on the earth?If one student can’t answer completely, ask two or three or more students.Ss: The explosion of the earth produced water vapor, which turned into water when the earth cooled down.T: Why is water important on the earth?Ss: Because water allowed the earth to dissolve harmful gases into the oceans and seas.T: No.3, finish the following form.21 small plants inwaterKey to the exercise:2. shellfish and all sorts of fish 5.amphibian(on land and in water) 7. reptiles (on land) 8.dinosaurs(on land) 9.mammals(on land) T: That ’s all for this passage. Now let ’s deal with some language points.ExplanationT: Turn to Page 25. Let’s look at the sentences:1. It exploded loudly with fire and rock, which were in time to produce the water vapour. which leads non-restrictive attributive clause. in time: sooner or later; eventually I ’ll see him in time.in time (for sth. /to do sth.): not late She will be back in time to prepare dinner. in / out of time: in/not in the correct time The audience clapped in time to the music.2. Nobody knew that it was going to be different from other planets going around the sun. be different from: not like someone or something else in one or more ways Note: We can use very, much, quite, entirely, totally to modify different City life is quite different from country life.going around the sun is-ing form that serves as attributive. Men breaking the law will be punished.Can you see the girl dancing with your boyfriend?3. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.3 green plants on land 4insects(on land) 56 forests78 9to come: serves as attributiveShe is the last person to do such a thing.depend on: something might only happen or be true if the circumstances are right for it Our success depends on whether everyone works hard or not. 4. Walking does need a bit of practice now that gravity has changed. now that: because of the fact that Now that I’m free, I can enjoy music for a while.Now t hat you ’ve grown up you can decide it yourself.Passage Analyzing Chart of the textHow life began on the earthText RetellingRetell the text using about 100 words. Step 6. HomeworkRetell the passage according to the form. Remember important language points.Period two Extensive readingStep 1Show some pictures of the astronauts in the spacewater1 small plants in water2 shellfish and all sorts of fish3 green plants on land4 insects (on land)5 amphibians (on land and in6 forests7 reptiles (on land) 8 dinosaurs (on land) 9 mammals (on land)10. small clever animals with hands and feet11. human4 insects(on land)5 amphibians(on land and in water)Step 2Read the passage and fill in the formStep 3 Language points1. Last month I was lucky enough to have a chance to make a trip into space with my friend Li Yanping, an astronomer.Enough: pron adj advThe boy is old enough to do to school.He couldn’t run quickly enough to catch up with the cat.2. Then we were off.be off = set offI am off today.We are off today.3 get close to靠近，接近，指动态变化be close to距......近，指状态The school is close to the post office4. But when I tried to step forward I found I was carried twice as far as on the earth and fell over.倍数+ as +形容词原级+ as + B”.1). “A + be +This tree is three times as tall as that one.His father is twice as old as he.倍数+形容词比较级+ than + B ”　2). “A + be +The Yangtze River is almost twice longer than the Pearl River.The number of students in our school is three times larger than that in theirs.倍数+ the +名词(size, length, amount) + of + B”3). “A + be +The newly broadened square is four times the size of the previous one.6. We watched, amazed as fire broke out on the outside of the spaceship as the earth increased.break out1) 战争爆发2) 发生争吵3) (火灾)发生7. cheer up; cheer sb. up感到高兴振奋8. masses of 许多，大量9. get the hang of 熟悉,掌握,理解10. exhausting (sth); exhausted (sb)Step 4 HomeworkCollect passages about gravity.Prepare for speaking.Period three Language Study Step 1. RevisionTranslate the following sentences1. 你迟早会成功的。