陕西省蓝田县前卫中学人教版高中英语必修三教案：Unit4AstronomythescienceofthestarsListening(2)

Unit 4 Astronomy the science of the stars Listening Teaching goals 教学目标 Target language目标语言 a. 重点词汇和短语 force, gradually, float, mass, cheer up, now that, break out b. 重点句子： When we get closer to the moon, we shall feel its gravity pulling us but it will not be as strong a pull as the earth's. P30 Walking does need a bit of practice now that gravity has changed. P31 We watched, amazed as fire broke out on the outside of the spaceship the earth's gravity increased. P31 Ability goals 能力目标 a. Discuss the three ways in which gravity changed on the moon. and some information about black holes. b. Discuss the questions about the passage: How did gravity change on the moon? What does a black hole look like? What will happen if an object is near the black hole? Teach the Ss to read passages with feeling. Learning ability goals 学能目标 Enable the Ss to get to know about gravity and black holes. Teaching important points 教学重点 Talk about gravity and black holes. Teaching difficult points 教学难点 a. Discuss the answers to the questions b. Teach the Ss to read the passage with feeling, paying attention to pronunciation and intonation. Teaching methods 教学方法 a. Fast reading b. Dealing with comprehension questions c. Discussion Teaching aids 教具准备 A projector, a computer, a recorder Teaching procedures & ways 教学过程与方式 Step Ⅰ Revision Check 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 astronaut? 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 quickly and fill in the form. Then check the answer. T: In last lesson, we have learned some information about gravity. Today we'll know gravity in details. Read the passage and fill in the form. 1 left the earth 2 in space 3 on the moon

The way gravity changed The gravity became very strong The gravity disappeared: It became very light.

The weight changed He 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 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 we've learnt something about black holes in Listening. Do you remember Stephen Hawking's idea about it? S: He thinks that black holes can both eat and spit objects out. T: Very good. Now we'll read the passage about black holes. Turn to Page66, read it quickly and try to find the answers to the questions. Questions: 1.Can a black hole be seen? How do you know it's 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 can't 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 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 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. T: Now talk about the form on Page 67 with your partners. (A few minutes later,) T: All right. We'll talk about the answers. Ask several students to answer them one by one, and then show suggested answers. Suggested answers: Old ideas about black holes Was this what we found? New ideas about black holes Black holes cannot be seen. Yes

Objects are pulled towards it. Yes

Objects go round and round outside the mouth of the Yes