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1、Using languageStep1. 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. The pull of the earth
2、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 contribution to the idea o
3、f 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 idea: I heard about how
4、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 best answer : 2. Listen
5、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 informationIt was only abo
6、ut 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 cant see a black hole.
7、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 like to know more about g
8、ravity?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 the earthVery strongVery
9、 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 word has been given.Last mo
10、nth 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 weightlessly in the cabin and I
11、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：Great! But just imagine that the moon
12、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 circle of lights?S: Large stars.T: What
13、 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 hole .T: What was happening?S: not mo
14、ve- 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 the gravity of a “black hole”.But
15、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 organize a story.
