1、madeofcanruohanxingUnit 4 Astronomy:Unit 4 Astronomy:the science of the starsthe science of the starsWarming upWhat are the names of the eight planets that circle our sun?海王星海王星 Neptune Neptune 水星水星Mercury Mercury 金星金星Venus Venus 地球地球Earth Earth 火星火星Mars Mars 木星木星Jupiter Jupiter 土星土星Saturn Saturn 天王
2、星天王星Uranus Uranus ReadingHOW LIFE BEGAN ON THE EARTHSkimmingI.Read the passage carefully and match the main idea with each paragraph.zx xkPara.1 The formation(形成形成)of the earth.Para.2 The importance of water for life.Para.3 A widely accepted theory about the formation of the universe.Para.4 The arri
3、val of humans and their impact on the earth.Para.5 The development of plants and animals on the earth.Work in pairs.Put the order of developmentof life into a timeline first according to your common sense,and then according to the reading passage.10 73 8 4 9 6 1 5 2 12 111.Insects and amphibians app
4、eared.3.The earth became a solid ball.5.Reptiles appeared.7.The earth was a cloud of dust.9.Shellfish and other fish appeared.11.Clever animals with hands and feet appeared.2.Dinosaurs appeared.4.Small plants grew on the water.6.Plants began to grow on dry land.8.Water appeared on the earth.10.The u
5、niverse began with a Big Bang.12.Mammals appeared.Read the text carefully and think about what you have read and discuss these questions in pairs.1.Why was the earth different from the other planets?Because water remained on the earth.2.Why did the plants grow before the animals came?Because plants
6、provided oxygen for animals to breathe.Zx xk3.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 have decided that one of them can no longe
7、r be considered a planet.Do you know the name of that planet?Zx xk 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.Read the text and fill in the blanks in the follo
8、wing form.TimeWhat happenedBig Bang_ began to form and combine to create stars and other bodies.AtomsBetween 4.5 and 3.8 billion years agoDust settled into a solid and _ globe.The earth exploded to produce its_.The continued _ of water allowed the earth to dissolve harmful gases and _ into the ocean
9、s and seas.violentatmospherepresenceacidsMany millions of years laterThe first small plants on the surface of the water produced_.Early _ and all sorts of fish appeared.Green plants began to grow on land.Insects and_ appeared.oxygenshellfishamphibiansMany millions of years later_ appeared and they l
10、aid eggs.Dinosaurs developed,laid eggs and _ for more than 140 million years.Mammals rose and _ babies.Reptilesexistedgave birth toAbout 2.6 million years agoSome small _ animals with hands and feet appeared and spread all over the earth.NowHumans produce too much carbon _,making the earth too hot.c
11、leverdioxideHow life began on the earth“Big Bang”other bodies_ starsEarth:a cloud of _atomsdustSummarya solid _the earths _other 4._Water:_ to the development of lifewater vapour nitrogen carbonextremely small _ on the surface of the waterglobegasesatmospherefundamentalplantsearly _ and all sorts of fishgreen plants on landland animalsinsectsamphibians_huge animals(dinosaurs)the rise of _human beingsshellfishreptilesmammalsHow life began on earth is one of the biggest puzzles that scientists found hard to solve.What other puzzles are hidden in the passage?Find them out and do some research.
