1、Unit 4 Astronomy: the science of the stars審核：高一英語組班級：姓名:Learning aims1. Get the students to know basic knowledge about Astronomy:the science of thestars.2. Read the text and try to understand the main idea of the text.Important and difficult points1. To understand the text fully,and the right order

2、of the development of life andthe earth.2. Let the students grasp the main idea and the structure of the passage.Instructions1. Review the new words and text in unit4.2. Arouse the studentsnterest in astronomy.3 Finish the exercisesby referring to your textbooks and tick out your difficultiesbefore

3、class.課前熱身：Task 1 . Phrase CheckI.繞轉(zhuǎn)3.熟知的理論5.及時；終于7.對關(guān)鍵9.使可能II.阻止做語篇導(dǎo)讀Task2Match the main idea of each paragraph2.根據(jù)4.向著四面八方6.冷卻8.連鎖反應(yīng)10.生育12.未來的幾百萬年impact on the earthTask3 True or false1. According to a widely accepted theory, the universe began wOkh “ BigBang ” , after which the earth was still a

4、 cloud of dust for several billionyears.()2. As the earth cooled down, water began to appear on its surface.()3. Water allowed the earth to dissolve harmful gasesand acids ,and it onlyappeared on the earth.( )4. As for mammals , they produced young generally by laying eggs.()5. Clever animals with h

5、ands and feet,in their turn, are protecting the earth wellinstead of other less important animals.()Task4. Detailed reading.1What happened after Big Bang?2What happened between 4.5 and 3.8 billion years ago ?3What were to make the earth atm osphere?4.Why water was important for making it possible fo

6、r life to develop?5.Did plants appear first or animals come first? And why?6.Which turned up first: reptiles,mammals or amphibians?7.What s the difference between mammals and reptiles?8. What are human beings doing at present?合作探究：1:The importance of water for lifeParagrapParagraph 3:Paragraph 4:Par

7、agraph 5:The development of plants andanimals on the earthThe formation of the earthA widely accepted theory aboutthe formation of the universeThe arrival of humans and theirWhat will happen when we put too much CO2 into the atmosphere?課后鞏固Put the order of development of life into a time line.A. insects and amphibians appearB. a solid ballC. reptiles appearD. a cloud of dustE. shellfish and other fish appearF. dinosaurs appearG. smal