浙江省苍南县高中英语 Unit 4 Astronomy the science of the stars（第5课时）导学案（无答案）新人教必修3（通用）

Unit 4 Astronomy the science of the stars第5课时第17周周二Teaching goals 学习目标1. Ability goals 能力目标Practice Sss abilty of listening and reading2. Learning ability goals 学能目标Enable Ss to get knowledge of great scientists and scienceTeaching important points教学重点a. the three scientists different ideas and the result of their workb. the experience of Li Yapings visit to the moonTeaching difficult points教学难点Understand the listening text.Teaching aids教具准备A recorder, a computer and a projector.Teaching procedures & ways教学过程与方式Step I Lead inT: 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 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 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 II Listening1. Listen to the tape and choose the best main idea of the listening passage (Ex.2 P30).Main idea: A The text is about how three scientists wanted to find out about the beginning of the universe.B The text is about how the idea of gravity has developed over a long period of time.C The text is about the importance of three scientists and their workThe best answer:Summary B is correct because it gives a clear idea of what the listening passage is about.Listen to the tape again and fill in the chart in Ex. 3 on P30.Isaac NewtonAlbert EinsteinStephen HawkingIdeaLarge bodies have a force which pulls things towards them.In space large objects make space and time bend; the larger the object, the further space and time bend.Black holes have a very large mass and pull things towards them.Development The bigger the object the stronger the gravity.Time goes slower in very strong gravity.If you go over the edge, you cannot get out; but if you do not, you may be able to escape.(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. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space - or so we think.)Step IIIReading1. passage understandingT: 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 gravity?Ss: Yes.T: Is the moons gravity the same as that of the earth?S1: No.T: Read the passage and then describe the three ways in which gravity changed for Li Yanping and how his weight changed.Ss:1. The pull of gravity became very strong he left the earths atmosphere. His weight is normal.2. It disappeared when he was in space. He is weightless.3. It was very light when he was on the moon. He weighs less than on earth.2. Language points1. . “walking does need a bit of practice now that gravity has changed.”.既然引力改变了，走路也的确需要练一练了。now that同since相似，语气较弱，强调人们已知的事实。2. We watched, amazed as fire broke out on the outside of the spaceship as the earths gravity increased.break out它与happen, take place, come out等词的用法一样，是不及物动词，不能带宾语，不能用于被动语态。1) 战争爆发e.g. The American Civil War broke out in 1861.美国内战爆发于1861年。2) 发生争吵e.g. A quarrel broke out between them. 他们之间发生了争吵。3) (火灾)发生e.g. Afirebrokeoutinhishouselastnight.昨晚他家里失火了。考点break out通常指战争、疾病、灾害等的爆发。不及物动词短语，不能用于被动语态。与break相关的短语:break down 打破; 毁掉; 破除; 坍塌;