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1、Unit 4 AstronomyBy2022/12/15In western countriesREADING How life began on the earth The text may tell us the _ of life on the earth.developmentFast reading Match the main ideaPara1Para 2Para3Para4Para5The development of plants and animals on the earth The importance of water for lifeThe appearance o

2、f humans and their effects on the earthThe formation of the earthA widely accepted theory about the formation of the universePara2 The formation of the earth Big Bangwatera cloud of dustatmospherea solid globeexplosionGroup work:Put them into the right orderPara3 The importance of waterwaterlife for

3、 life to developdissolve harmful gases and acids Role playEarth:I make it possible_.Do you envy me?Mars:Of course.Why no one wants to live with me?Earth:Because I have _ while you havent now.Mars:Why is it so f_?Earth:Because it helps to _ into _.Mars:I see.Thats why people always say where there is

4、 _,there is _.oceans and seaswaterundamentalPara 4 The development of lifeExtremely small plants in waterShellfish and all sorts of fishInsects(on land)Amphibian(on land and in water)Green plants on landForestsReptiles(on land)Dinosaurs(on land)Mammals(on land)PlantsAnimalsoxygenThinking:Is it right

5、 to show films with dinosaurs and people together?Can you give me your reason?Because dinosaurs died out long before human beings developed on the earth.plants animals water shellfish&fishinsects amphibiansreptiles dinosaursmammalshuman beings small plants in watergreen plants on landforestsHow is l

6、ife changed?landsimplecomplexa few kindsvarious kindsDo we take good care of the earth?Discussion:What can we do to protect our earth?Sample sentences:1.What I want to suggest is that2.What is even more important is that 3.It is essential that we shouldOnly if we understand,can we care;Only if we care,will we help;Only if we help,shall all be saved.Jane Goodall Read together1.Reading aloud the passage after class.2.Making a poster about the World Earth Day.Homework