人教版高中英语必修三第四单元PPT课件

1、1Module III Unit 4Astronomy玉树二高2014级高一十四班 2I. Warming upI. Warming upW h a t s t h e m e a n i n g o f t h e w o r d “Astronomy”? 2. Do you know the following terms? star（ ） planet（ ） the sun / moon / earth（ ） solar system（ ）3. How many planets are in the solar system? 3I. Warming upI. Warming upW h

2、 a t s t h e m e a n i n g o f t h e w o r d “Astronomy”? the science of stars;2. Do you know the following terms? star（恒星） planet（ 行星 ） the sun / moon / earth（ 太阳、月亮、地球 ） solar system（ 太阳系 ）3. How many planets are there in the solar system? 84Scientists now think Pluto is too small to be called a p

3、lanet5The names of eight planetsThe names of eight planets1) 1) 水星水星 MercuryMercury2) 2) 金星金星 VenusVenus3) 3) 地球地球 EarthEarth4) 4) 火星火星 MarsMars5) 5) 木星木星 JupiterJupiter6) 6) 土星土星 SaturnSaturn7) 7) 天王星天王星 UranusUranus8) 8) 海王星海王星 NeptuneNeptune6海王星海王星 Neptune水星水星Mercury 金星金星Venus 地球地球Earth 火星火星Mars

4、木星木星Jupiter 土星土星Saturn天王星天王星Uranus 7In this unit, well learn something In this unit, well learn something more scientificmore scientific1.Whats the title of the text? how life began on the earth2. From the title, we can predict that the text may tell us the origin of life on the earth. Do you know s

5、ome stories about it?8Pangu separates the sky from the earthPangu separates the sky from the earth9 Nvwa made humansNvwa made humans10Read the passage quickly and answer the Read the passage quickly and answer the questionsquestions1. When did the “Big Bang” happen?2. What form was the earth after t

6、he “Big Bang”?3. What made up the earths atmosphere？4. How did water come into being on the earth?5. Whats the significance of the presence of water on the earth?6.What was important to the development of fish?7. What made possible the rise of mammals on the earth? 8. Why are mammals different from

7、all life forms in the past?11 Phrases and Useful ExpressionsPhrases and Useful Expressionscircle around circle around 绕绕 转转according to according to 根据根据 a widely accepted theory a widely accepted theory 熟知的理论熟知的理论in all directions in all directions 向着四面八方向着四面八方 in time in time 及时；终于及时；终于cool down c

8、ool down 冷却冷却be fundamental to be fundamental to 对对 关键关键a chain action a chain action 连锁反应连锁反应 make it possible forto do make it possible forto do 使使 可能可能 give birth to give birth to 生育生育11. prevent from 11. prevent from 阻止阻止 做做 12. millions of years to come 12. millions of years to come 未来的几百万年未来的几

9、百万年121. When did the “Big Bang” happen?1. When did the “Big Bang” happen? It happened several billion years agoIt happened several billion years ago. .Scanning Read the passage quickly and answer Read the passage quickly and answer the questionsthe questions132. What form was the earth after the “Bi

10、g 2. What form was the earth after the “Big Bang”?Bang”? The earth was still just a cloud of dustThe earth was still just a cloud of dust. .3. What made up the earths atmosphere after 3. What made up the earths atmosphere after the earth exploded?the earth exploded? Carbon, nitrogen, water vapour an

11、d other Carbon, nitrogen, water vapour and other gasesgases. .144. How did water come into being on the 4. How did water come into being on the earth?earth? As the earth cooled downAs the earth cooled down after it exploded, after it exploded, water came into beingwater came into being. .155. Whats

12、the significance of the 5. Whats the significance of the presence of water on the earth?presence of water on the earth? It allowed the earth to dissolve harmful It allowed the earth to dissolve harmful gases and acids into the oceans and gases and acids into the oceans and seas.seas.166. What was im

13、portant to the development of 6. What was important to the development of fish?fish? oxygen. 7. What made possible the rise of mammals on 7. What made possible the rise of mammals on the earth?the earth? The disappearance of dinosaurs made the possible the rise of mammals on the earth.178. Why are m

14、ammals different from all life 8. Why are mammals different from all life forms in the past?forms in the past? They gave birth to young baby animals and produced milk to feed them.18Close readingI. Read the passage carefully I. Read the passage carefully and match the main idea and match the main id

15、ea with each paragraph. with each paragraph. 19Para. 1 Para. 1 A.A.The formation (The formation (形成形成) of the earth. ) of the earth. Para. 2 Para. 2 B.B.The importance of water for life.The importance of water for life. Para. 3 Para. 3 C.C.A widely accepted theory about A widely accepted theory abou

16、t the formation of the universe.the formation of the universe.Para. 4 Para. 4 D.D.The arrival of humans and The arrival of humans and their impact on the earth. their impact on the earth. Para. 5 Para. 5 E.E.The development of plants The development of plants and animals on the earth. and animals on

17、 the earth.20 True (T) or False (F).True (T) or False (F).1. The earth appeared before the Big Bang happened.2. The original atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Life began in water and then on

18、 land.FFTT21 Summary SummaryWhat do we learn today?22 Summary SummaryHow life began on the earth.23Put the order of development of Put the order of development of life into a timeline.Use the life into a timeline.Use the reading passage to help you.reading passage to help you.1.Insects and amphibians appeared.( 10)2.Dinosaurs appeared.( )3.The earth became a solid ball.( )4.Small plants grew on the water.(8 )5.Reptiles appeared.( )6.Plants began to grow on dry land.(