《高一英语（下）必修三Unit 4 课时教案Period 2.doc》由会员分享，可在线阅读，更多相关《高一英语（下）必修三Unit 4 课时教案Period 2.doc（3页珍藏版）》请在金锄头文库上搜索。
1、Period 2 Using language $ Reading taskStep1. Lead in T: We have learnt a lot about astronomy, have you got interested in it? If you are going to study astronomy, what problem will you face most?S2:Gravity. T: What is gravity? S3: Everything will fall back to the earth if it is dropped or thrown away
2、. The pull of the earth is called gravity. T: Quite right. Who first got the idea of gravity? S4: Isaac Newton. T: How did he get the idea? S5: One day he was sitting under the tree. He saw an apple fall, which made him get the idea. Besides Newton, are there any other scientists who made a great co
3、ntribution to the idea of gravity?S6: Albert Einstein, Stephen Hawking. T: How did each of them think of gravity? Or did they share the same idea of gravity? Come on, the tape will tell you. Step 2 Listening1. Listen to the tape and choose the best main idea of the listening passage (Ex.2 P30).Main
4、idea: I heard about how three men made mistakes when they tried to describe gravity. I heard about how three men wanted to find out about the beginning of the universe. I heard about how the idea of gravity has developed over a long period of time. I heard about three scientists and their work. The
5、best answer : 2. Listen to the tape again and fill in the chart in Ex. 1 on P30.Isaac NewtonAlbert EinsteinStephen HawkingDates1642-17271879-19551942-IdeaEverything is affected by a force called gravityGravity is connected to time and space“Black holes” “eat” objects but also “spit” them outOther in
6、formationIt was only about the earthIt was about the universeIt was about things found in the universe called “black holes”(Note: Astronomers and scientists think that a black hole is a region of space (not a thing) into which matter has fallen and from which nothing can escape not even light. So we
7、 cant see a black hole. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space - or so we think.)Step3.Reading1. Fast readingT: All the three great scientists Newton, Einstein and Hawking played an important role in the development of ideas of gravity. Would you l
8、ike to know more about gravity?Ss: Yes.T: Is the moons gravity the same as that of the earth?S1: No.T: Read fast to see how many times would the force of gravity change?S2: Three.2.Careful readingT: What are the three times? How would the force of gravity change? And how did our weight change?Leave
9、the earth Very strongVery heavyIn space DisappearedFloated weightlesslyOn the moonVery light The mass will be less3.Summary T: Good! I am sure you must know more about the gravity. Suppose you are asked to make a summary about the trip, will you try? You only need to fill the blacks and the first wo
10、rd has been given.Last month I visited the moon with my friend. Before we left, I was told the force of gravity_ would change three times on our journey. Then we took off. As we left the earth, I became very heavy_. Gradually the weight lessened_. When I was in space, it disappeared_. We floated_ we
11、ightlessly in the cabin and I cheered up_. When I was on the moon, I was surprised to find out even walking needs lots of practice now that_ gravity changed. The returning of the earth was very frightening_. We were amazed to watch fire break out_ on the outside of the ship.Step4. Reading taskT：Grea
12、t! But just imagine that the moon has great gravity, then what will happen?S3: It will pull us.T: Right, maybe when we are approaching it, we will be caught in it. So lets come to the black hole.T: What are in the black hole?S: A large circle of lights going round an empty space.T: What is the circl
13、e of lights?S: Large stars.T: What is the empty space like?S: It looks like a mouth needing to be fed.T: How did they feel?S: They watched in shock and amazement as a large sun suddenly disappeared into the hole.T: So what did they decide to do?S: They decided to turn the spaceship away from the hol
14、e .T: What was happening?S: not move- jump and move around the edge of the outside of the hole- pulling us slowly into its “mouth”- go faster and faster.T: What did the author feel?S: feel sick, the watch moves slower and slower, my mouth dry, close my eyes.T: It seemed that they would be caught by
15、the gravity of a “black hole”. But what happened later?S: jump again- increase its speed- as fast as light- flew like a bird.T: This time, how was the author affected?S: was bumped and banged- able to look around us- the computer started working again.T: What did the author feel?S: Exciting.T: Why?S: They realized that they had discovered something new about “black hole”- They “eat some objects but “spit” other objects out. Step5. Homework1. Search for more about the black hole.2. Read these two passages again to find out how to org
