河北省石家庄市第一中学高中英语 unit4 Astronomy reading教案2 新人教版必修3.doc

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1、河北省石家庄市第一中学高中英语 unit4 Astronomy reading教案2 新人教版必修3教材章节Unit 4课题Astronomy课型Reading 教学目标知识与能力知识内容force, gradually, float, mass, cheer up, now that, break out等级水平(A)识记(B)理解(C)应用(D)分析(E)综合(F)评价能力目标a Discuss the three ways in which gravity changed on the moon. and some information about black holes.b. Dis

2、cuss the questions about the passage:过程与方法a. Fast readingb. Dealing with comprehension questionsc. Discussion 情感态度与价值观Enable the Ss to get to know about gravity and black holes.教学设计重点难点分析Talk about gravity and black holes.Discuss the answers to the questionsTeach the Ss to read the passage with feel

3、ing, paying attention to pronunciation and intonation.教学技术设备Blackboard and multimedia教学环节学习目标1、学习的主要知识force, gradually, float, mass, cheer up, now that, break out2、需要掌握的方法To get the general idea of a passage by scanning it.课题概述1、 本节知识的主要意义know about gravity and black holes.2. 本节知识在知识体系中的地位和联系lKnowle

4、dge and culture are well mixed together in this passage石家庄市第一中学教案教 学 环 节分 析 讲 解学生活动设计Step I RevisionCheck homework T: Last class we have learned different ideas about gravity, what quality an astronaut should have and some equipment on a spacesuit. Now answer the question: What needs to be an astron

5、aut?S: An astronaut should have good health, excellent degree, many years training, right height and weight. They also should be calm, firm, patient, mature and hard-working. They must be able to adapt to the harshness of life in space. Step II Reading (Page30)1.Ask the students to read the passage

6、quickly and fill in the form. Then check the answer.T: In last lesson, we have learned some information about gravity. Today well know gravity in details. Read the passage and fill in the form.1 left the earth2 in space3 on the moonThe way gravity changed The gravity became very strong The gravity d

7、isappearedIt became very light.,The weight changedHe became very heavy.He had no weight and could float around like a feather.He was about one-sixth of his weight on the earth.2.Listen to the tape and imitate he tape. Then practice reading aloud the dialogue with feeling.3.Ask two or three pairs of

8、Ss to read the passage with feeling.Step III Reading Task (Page66)This reading passage is about black holes. After the first reading, let the Ss answer some questions. Show the questions on the screen. Then, let them talk about the form on page 67 after reading the text again.T: Last time weve learn

9、t something about black holes in Listening. Do you remember Stephen Hawkings idea about it? S: He thinks that black holes can both eat and spit objects out. T: Very good. Now well read the passage about black holes. Turn to Page66, read it quickly and try to find the answers to the questions.Questio

10、ns: 1.Can a black hole be seen? How do you know its a black hole? 2.What happened to the spaceship from the beginning to the end?Check the answer with the whole class.Answers: 1.No, it cant be seen. You can see things disappear into what appears to be an empty space.2.At first the lights on the spac

11、eship went out and the computer stopped working.Then the spaceship jumped and began to move around the edge of the outside of the hole.As the spaceship moved around the hole, it began to go faster and faster.But then the spaceship jumped again, and it moved sideways from the black hole.It began to i

12、ncrease its speed until it seemed to be going as fast as light.At last the spaceship slowed down and the computer started working again.T: Now talk about the form on Page 67 with your partners.(A few minutes later,)T: All right. Well talk about the answers. Ask several students to answer them one by

13、 one, and then show suggested answers.Suggested answers:Old ideas about black holesWas this what we found?New ideas about black holesBlack holes cannot be seen.Yes Objects are pulled towards it.YesObjects go round and round outside the mouth of the black hole.YesObjects as large as suns can disappea

14、r into the black hole.YesAll objects must go into the black hole when they are caught by its gravity.No They can be thrown far from the black hole by the energy in the black hole.Time slows down when youre close to a black hole.YesStep IV Extra-readingHere is a supplementary reading material on the

15、screen, a passage about black holes. Read it carefully and then do some comprehension exercises with their partners. T: Till now, we have learned two passages about gravity and black holes. Here is a supplementary reading material on the screen. Read it carefully and prepare to do some reading compr

16、ehension exercises with your partners.Questions: 1.Whats a black hole?2.Why is it called black hole?3.What is called the singularity? 4.What is called the event horizon?What is a Black Hole?A black hole is what remains when a massive star dies. If you have read How Stars Work, then you know that a s

17、tar is a huge, amazing fusion reactor. Because stars are so massive and made out of gas, there is an intense gravitational field that is always trying to collapse the star. The fusion reactions happening in the core are like a giant fusion bomb that is trying to explode the star. The balance between

18、 the gravitational forces and the explosive forces is what defines the size of the star. As the star dies, the nuclear fusion reactions stop because the fuel for these reactions gets burned up. At the same time, the stars gravity pulls material inward and compresses the core. As the core compresses,

19、 it heats up and eventually creates a supernova explosion in which the material and radiation blasts out into space. What remains is the highly compressed, and extremely massive core. HistoryThe concept of an object from which light could not escape (e.g., black hole) was originally proposed by Pier

20、re Simon Laplace in 1795. Using Newtons Theory of Gravity, Laplace calculated that if an object were compressed into a small enough radius, then the escape velocity of that object would be faster than the speed of light.The cores gravity is so strong that even light cannot escape. This object is now

21、 a black hole and literally disappears from view. Because the cores gravity is so strong, the core sinks through the fabric of space-time, creating a hole in space-time - this is why the object is called a black hole. Photo courtesy NASAArtist concept of a black hole: The arrows show the paths of ob

22、jects in and around the opening of the black hole.The core becomes the central part of the black hole called the singularity. The opening of the hole is called the event horizon. You can think of the event horizon as the mouth of the black hole. Once something passes the event horizon, it is gone fo

23、r good. Once inside the event horizon, all events (points in space-time) stop, and nothing (even light) can escape. The radius of the event horizon is called the Schwarzschild radius, named after astronomer Karl Schwarzschild, whose work led to the theory of black holes.Suggested answers: 1. A black

24、 hole is what remains when a massive star dies. 2. Because the cores gravity is so strong, the core sinks through the fabric of space-time, creating a hole in space-time - this is why the object is called a black hole. 3.The core becomes the central part of the black hole called the singularity. 4.T

25、he opening of the hole is called the event horizon. Listen to the tape, have a discussion and answer the questions Ask the students to ask and answer the phrases learnt. Make sentences using the words and phrases.石家庄市第一中学教案当堂训练Questions: 1.Can a black hole be seen? How do you know its a black hole?

26、2.What happened to the spaceship from the beginning to the end?Answers: 1.No, it cant be seen. You can see things disappear into what appears to be an empty space.2.At first the lights on the spaceship went out and the computer stopped working.Then the spaceship jumped and began to move around the e

27、dge of the outside of the hole.As the spaceship moved around the hole, it began to go faster and faster.But then the spaceship jumped again, and it moved sideways from the black hole.It began to increase its speed until it seemed to be going as fast as light.At last the spaceship slowed down and the computer started working again.课堂小结force, gradually, float, mass, cheer up, now that, break out课后作业Collect passages about gravity.Prepare for speaking板书设计Unit 4 AstronomyA Visit to the moonforce, gradually, float, mass, cheer up, now that, break out教学反思6