人教版高中英语必修三 Unit 4_A stronomy (共28张PPT).ppt

1、Module III Unit 4AstronomyI.Warming up1.Whatsthemeaningof the word“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?I.Warming up1.Whats the meaning of the word“Astronomy”?the science of stars;2.Do you know the fol

2、lowing 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?8Scientistsnow thinkPlutois too small to be called a planetThe names of eight planets1)水星Mercury2)金星Venus3)地球Earth4)火星Mars5)木星Jupiter6)土星Saturn7)天王星Uranus8)海王星Neptune海王星Neptun

3、e水星Mercury 金星Venus 地球Earth 火星Mars 木星Jupiter 土星Saturn天王星Uranus In this unit,well learn something more 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 some stories about it?Pangu se

4、parates the sky from the earth Nvwa made humansRead the passage quickly and answer the questions1.When did the“Big Bang”happen?2.What form was the earth after the“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 w

5、ater 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 all life forms in the past?Phrases and Useful Expressions1.circle around 绕转2.according to根据3.a widely accepted theory 熟知的理论4.in all directions 向着四面

6、八方5.in time 及时；终于6.cool down 冷却7.be fundamental to对关键8.a chain action 连锁反应9.make it possible forto do 使可能10.give birth to生育11.prevent from 阻止做12.millions of years to come 未来的几百万年1.When did the“Big Bang”happen?It happened several billion years ago.Scanning Read the passage quickly and answer the ques

7、tions2.What form was the earth after the“Big Bang”?The earth was still just a cloud of dust.3.What made up the earths atmosphere after the earth exploded?Carbon,nitrogen,water vapour and other gases.4.How did water come into being on the earth?As the earth cooled downafter it exploded,water came int

8、o being.5.Whats the significance of the presence of water on the earth?It allowed the earth to dissolve harmful gases and acids into the oceans and seas.6.What was important to the development of fish?oxygen.7.What made possible the rise of mammals on the earth?The disappearance of dinosaurs made th

9、e possible the rise of mammals on the earth.8.Why are mammals different from all life forms in the past?They gave birth to young baby animals and produced milk to feed them.Close readingI.Read the passage carefully and match the main idea with each paragraph.Para.1 A.The formation(形成)of the earth.Pa

10、ra.2 B.The importance of water for life.Para.3 C.A widely accepted theory about the formation of the universe.Para.4 D.The arrival of humans and their impact on the earth.Para.5 E.The development of plants and animals on the earth.True(T)or False(F).1.The earth appeared before the Big Bang happened.

11、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 land.FFTT SummaryWhat do we learn today?SummaryHow life began on the earth.Put the order of development of life i

12、nto a timeline.Use the 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.()7.The earth was a cloud of dust.()8.Water appeared on the e

13、arth.(1)9.Shellfish and other fish appeared.()10.The universe began with a Big Bang.()11.Clever animals with hands and feet appeared.(12)12.Mammals appeared.()discussingWhat should we do for our earth?You can use the following words or phrases to help you:prevent from /harmful global warming/carbon dioxide /depend on as a result /in turn Homework1.Find the difficulties in the passage.2.Finish Learning about Language part on Page28.EndThankyou