必修三Unit 4 Astronomy： the science of the stars教案

1、必修三Unit 4 Astronomy： the science of the starsTeaching aimsKnowledge aims Get students to learn the useful new words and expressions in this part： theory, atom, billion, globe, violent, carbon, atmosphere, fundamental, harmful, acid, multiply, oxygen, exist, prevent, dioxideAbility aims a. Enable Ss

2、to talk about the science of the stars.b. Enable Ss to understand the development of life.c. Develop Ss reading abilityEmotion aims Train Ss interest in science and stimulate their love for astronomy.Teaching important points Get Ss to learn different reading skills.Teaching difficult pointsGet Ss t

3、o read and understand the reading text.Teaching aidsA recorder, a computer and a projector. Teaching proceduresStep I Lead-in and Warming upT： Hello, everyone! Today well come to Unit 4 Astronomy. Before that I have a question： What is astronomy? Astronomy is the scientific study of the universe and

4、 the heaven bodies (such as the sun, the moon, and stars), gas, and dust within it. T： Do you know the solar system? What are the names of the eight planets that circle the sun in the solar system?水星Mercury 金星Venus 地球Earth 火星Mars木星Jupiter 木星Jupiter 天王星Uranus 海王星NeptuneStep II Pre-reading 1.Each reli

5、gion and culture has its own ideas about how life began on earth. What do you know?A. Pangu separates the sky from the earthThe sky and the earth were at first one blurred entity like an egg. Pangu was born into it. The separation of the sky and the earth took 18,000 years- the Yang which was light

6、and pure rose to become the sky, and the Yin which was heavy and murky sank to form the earth. Between them was Pangu, who went through nine changes every day, his wisdom, greater than that of the sky and his ability greater than that of the earth. Every day the sky rose ten feet higher, the earth b

7、ecame ten feet thicker, and Pangu grew ten feet taller. Another 18,000 years passed, and there was an extremely high sky, an extremely thick earth, and an extremely tall Pangu. Then came the Three Emperors (the Emperor of the Sky, the Emperor of the Earth, and the Emperor of the Men.)So these number

8、s came into existence and evolve like this. The number begins with one, becomes established at three, is completed at five, prospers at seven, and ends in nine. So the sky is ninety thousand li from the earth.B. The Biblical Account“In the beginning God created the heavens and the earth. The earth w

9、as formless and empty, darkness was over the surface of the deep, and the spirit of God was hovering over the waters. And God said.”Day 1： God spoke and separated light from darkness creating Day and Night Day 2： God spoke and separated the water creating sky and ocean Day 3： God spoke and created d

10、ry land Day 4： God spoke and created the sun, moon and stars Day 5： God spoke and created living creatures in the air and sea Day 6： God spoke and created the land animals and man Day 7： God rested and blessed this day calling it Holy 2. Read the title and look at the pictures. Predict what the read

11、ing will be about. Step ReadingA. SkimmingRead the text quickly and match the main idea with each paragraph.Para.1： A widely accepted theory about the formation of the universePara 2： The formation of the earthPara.3： The importance of water for lifePara.4： The development of plants and animals on t

12、he earthPara.5： The arrival of humans and their impact on the earth B. Scanning 1. When did the “Big Bang” happen?It happened several billion years ago.2. What made up the earths atmosphere after the earth exploded?Carbon, nitrogen, water vapour and other gases. 3. Whats the significance of the pres

13、ence of water on the earth?It allowed the earth to dissolve harmful gases and acids into the oceans and seas.4. What made possible the rise of mammals on the earth?The disappearance of dinosaurs made possible the rise of mammals on the earth.5. Why are mammals different from all life forms in the pa

14、st?They gave birth to young baby animals and produced milk to feed them. C. Close readingI. Read the text and fill in the blanks in the form on PPT. II. Answer the following questions.1. Why was the earth different from the other planets? Because water remained on the earth.2. Why did the plants gro

15、w before the animals came? Because plants provided oxygen for animals to breathe.3. Why is it wrong to show films with dinosaurs and people together?Because dinosaurs died out long before human beings developed on the earth.4. There used to be nine planets in the solar system. Recently scientists ha

16、ve decided that one of them can no longer be considered a planet. Do you know the name of that planet? Do you know why they removed it? The name is Pluto. Scientists now think it is too small to be called a planet.5. What problem is caused by human beings?Human beings cause global warming.III. True

17、(T) or False (F).F 1. The earth appeared before the Big Bang happened.F 2. The original atmosphere consisted of nitrogen and oxygen. T 3. The main difference between the earth and other planets is that there is water on the earth. T 4. Life began in water and then on land.F 5. Mammals appeared before the development of dinosaurs.F 6. Dinosaurs could give birth to young baby animals and produced milk to feed them. T 7. Human beings produce too much ca