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1、Unit 4solar system太阳系太阳系SunVenusMercuryMarsJupiterSaturnEarthPlutoNeptuneUranusBut scientists now think Pluto is too small to be called a planet.THE SOLAR SYSTEM Can you name each planet correctly using the letters given in the table below? A.地球地球 _B.木星木星 _C.火星火星 _D.水星水星 _E.海王星海王星 _F. 冥王星冥王星 _G. 土星土
2、星 _H. 天王星天王星 _I. 金星金星 _EarthJupiterMarsMercuryNeptunePlutoSaturnUranusVenusDo you know how our life began on the earth?Do you know any ancient idea about the beginning of the universe?Big BangHOW LIFE BEGAN ON THE EARTH?1. What is the original earths atmosphere made up of? 2. What is the fundamental
3、 to the development of life?3. Which kind of life-being first appeared on the earth, plants or animals? 4. Main idea of each paragraphScanningScan the passage quickly to answer the following questions.carbon, nitrogen, water vapour, and other gases2. what is fundamental to the development of life?Wa
4、ter1. What is the original earths atmosphere made up of?3. Which kind of life-being first appeared on the earth, plants or animals? Why?At first, small plants began to appear on the surface of the water, they produce oxygen, which encouraged the later development of early shellfish and all sorts of
5、fish.4.Choose the main idea for each paragraph( )The arrival of humans and their impact on the earth.( )The formation of the earth.( )The development of plants and animals on the earth.( )A widely accepted theory about the formation of the universe.( )The importance of water for life.54213Passage st
6、ructureMain bodyPara 1: Para 2:Para 3:Para 4: Para 5: A widely accepted theory about the formation of the universe.The formation of the earth.The importance of water for life.The development of plants and animals on the earth.The arrival of humans and their impact on the earth.Read the passage caref
7、ully and analyse its structure:earth, atmosphere and waterlife developmentHuman beings（ ）A Insects and amphibians appeared.（ ）B Dinosaurs appeared.（ ）C The earth became a solid ball.（ ）D Small plants grew on the water. （ ）E Reptiles appeared.（ ）F Plants began to grow on dry land.（ ）G The earth was a
8、 cloud of dust.（ ）H Water appeared on the earth.（ I Shellfish and other fish appeared.（ ）J The universe began with a “Big Bang”.（ ）K Clever animals with hands and feet appeared.（ ）L Mammals apeared.5106）2948371 Detailed readingPut the order of development of life into a time line. 12 11 Post reading
9、After reading the passage, discuss the following questions.1. Why was the earth different from the other planets?2. Why is it wrong to show films with dinosaurs and people together?Because the water remained on the earth.Because dinosaurs died out long before human beings developed on the earth.Post
10、 readingAfter reading the passage, discuss the following questions.3. What problem is caused by human beings?Human beings causes global warming.Lets review the evolution of life on the earth.After the “Big Bang”, the earth was full of water.Original cells appeared in the ocean.The cells in the water
11、 began to separate. Marine animals came into being.Some animals (amphibian & insects) came to land.Reptile appeared. dinosaurs dinosaurs MammalsMan had evolved from apes. They developed new methods of growing food, hunting and moving around. As time went by they covered the earth and have become the
12、 most important animals on the planet.We are making the world better.We are making the world worse.ABDiscussion developed new methods of growing food(1) What humans developed?developed new methods of hunting developed new methods of moving aroundGreenhouse effect(2) But they are not taking care of t
13、he earth very well. What problem are humans causing ?putting carbon dioxide into the atmospherethe earth may become too hotAs a student, what little things can we do for the earth? solar energy plant trees recycle rubbish prevent desertificationsave water purify airWhether life will continue on the earth depends on human beings.Only if we care will we help,only if we help shall all be saved!Assignment:1. Collect more information about the development of life and make a poster with your group members.2. Read and retell the passage.
