1、What subjects do you learn at school?lChineselEnglish lmathematicslphysicslchemistrylgeographylhistorylpoliticsScience subjects?Unit 4Astronomy:the science of the starsAstronomy is the scientific study of the is the scientific study of the universeuniverse and the heaven bodies(such as the sun,and t
2、he heaven bodies(such as the sun,the moon,and stars),gas,and dust within it.the moon,and stars),gas,and dust within it.astronomerThe Solar system eighteight planets planets many comets many comets other objects other objectsEight planetsMercury(Mercury(水星）水星）VenusVenus（金星）（金星）MarsMars（火星）（火星）Jupiter
3、(Jupiter(木星木星)Uranus(Uranus(天王星）天王星）Neptune(Neptune(海王星）海王星）Saturn(Saturn(土星土星)THE SOLAR SYSTEMCan you name each planet correctlycorrectly 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 _FF.海王星海王星 _G.G.土星土星 _H.H.天王星天王星 _I.I.金星金星 _EarthJupiterMarsMercuryNeptuneSaturnUranusV
4、enus你你记记住住了了吗吗？How did the universe come into being?The universe began with_The universe began with_aa BigBig BangBangthat threw matter in all directionsthat threw matter in all directionsStephen HawkingAfter that,atoms began to form and combine to create stars and other bodies.1.reptiles1.reptiles（
5、爬行类）（爬行类）2.mammals(2.mammals(哺乳类哺乳类)3.shellfish3.shellfish（贝类）（贝类）4.fish4.fish5.insects5.insects6.amphibians6.amphibians（两栖类）（两栖类）The groups of life(物种)Look at the pictures and tell the groups.Look at the pictures and tell the groups.HOW LIFE BEGAN ON THE EARTHWhat is the most important condition fo
6、r life to What is the most important condition for life to growgrow?How did life begin on the earth?How did life begin on the earth?Water Air(atmosphere)?What is the What is the fundamentalfundamental condition for life to grow condition for life to grow?How did appearHow did come into being1.For se
7、veral 1.For several billionbillion years after the“big bang”,the earth years after the“big bang”,the earth was still just _ was still just _ 2.Between 4.5 and 3.8 billion years ago,2.Between 4.5 and 3.8 billion years ago,_3.The earth became so violent that 3.The earth became so violent that _4.They
8、were 4.They were in timein time to produce to produce_5.As the earth cooled down,5.As the earth cooled down,_How did water and atmosphere appear?a cloud of dustthe dust settled into a solid globeit exploded loudly with fire&rockcarbon,nitrogen,water vapour and other gaseswater began to appear on its
9、 surface1.大爆炸后好几十亿年过去了，但地球还只是一团尘埃。AA 2.到3845亿年前，这团尘埃慢慢形成了一个固体的球状物。3.地球变得如此猛烈以致爆炸喷出了烈火和岩石。AA 4.他们最终产生了碳、氮气、水蒸气和其他多种气体。AA 5.当地球冷却下来，地球的表面就开始现了水。AA 11 WhyWhy was the earth different from other planets?was the earth different from other planets?A It produced a lot of heat A It produced a lot of heat B B
10、 The water The water remainedremainedC Water C Water disappeared Ddisappeared D It was the oldest planet It was the oldest planet22 Why was life able to develop on the Why was life able to develop on the earthearth but not but not on other planets?on other planets?A The earth had a solid shape A The
11、 earth had a solid shape B The earth did not have harmful gases in its atmosphereB The earth did not have harmful gases in its atmosphereC The water stayed on the earth but C The water stayed on the earth but not onnot on other planets other planetsD The earth was not too hot but not too D The earth
12、 was not too hot but not too coldcoldChoose the right answerThe The continued presencecontinued presence of water allowed the of water allowed the earth to earth to dissolvedissolve harmful gases and harmful gases and acids acids into the into the oceans and seas.oceans and seas.?The reason for the
13、The reason for the appearanceappearanceLife formsLife formsLife featuresLife featuresLiving Living situationssituationsSmall plantsSmall plantsOxygenOxygen provided by provided by small plantssmall plantsOn landOn landProduce young by Produce young by layinglaying eggs eggspresence of waterpresence
14、of waterMultiply and fill with Multiply and fill with On the On the surface surface ShellfishShellfish,fish,fishIn the oceanIn the oceanGreen plantsGreen plantsLand Land animals:animals:insects,insects,amphibiansamphibiansLive on land as Live on land as well as in the waterwell as in the waterOn lan
15、d or On land or in the waterin the waterreptilesreptileson landon landDinosaursDinosaursLay eggs and exist Lay eggs and exist on landon landMammalsMammalsGive birth to the Give birth to the young which feed young which feed on milkon milkon landon landPlants grow into forsetsPlants grow into forsets
16、PutPut the order of development of life into a time the order of development of life into a time lineline（）A insects and amphibians appearA insects and amphibians appear（）B a solid ballB a solid ball（）C reptiles appearC reptiles appear（）D a cloud of dustD a cloud of dust（）E shellfish and other fish
17、appearE shellfish and other fish appear（）F dinosaurs appearF dinosaurs appear（）G small plants grow on the waterG small plants grow on the water（）H plants begin to grow on dry landH plants begin to grow on dry land（）I presence of waterI presence of water（）J mammals(including humans)appearJ mammals(in
18、cluding humans)appear11223344556677889910 10 3 Why was it necessary for plants to grow before 3 Why was it necessary for plants to grow before animals?animals?A Animals needed plants to protect them from the sun A Animals needed plants to protect them from the sun B Plants provided oxygen for animal
19、s to breatheB Plants provided oxygen for animals to breatheC Animals could hide from hunters in forests.C Animals could hide from hunters in forests.D It was easier for plants to grow.D It was easier for plants to grow.44 What problem is caused by human being?What problem is caused by human being?A
20、They exist everywhere on the earthA They exist everywhere on the earthB They cause global warming B They cause global warming C They find new methods of growing cropsC They find new methods of growing cropsD They enjoy hunting and fishingD They enjoy hunting and fishingChoose the right answer?They a
21、re putting too much They are putting too much carbon dioxidecarbon dioxide into the into the atmosphere,which atmosphere,which preventsprevents heart heart fromfrom escaping from the escaping from the earth into space.earth into space.Text Retelling The explosion of the earth produced_ _,which turne
22、d into water when the earth cooled down.Water allowed the earth to _ harmful gases into the oceans and seas.That made it possible for _ to begin to develop.The arrival of small _ encouraged the development of early _ and all sorts of fish.Many millions of years later the first green plants began to
23、appear on land.watervapourdissolvelifeplantsshellfishLater land animals appeared.Some were_.Others,called_,were able to live on land as well as in the sea.When the plants grew into forests,_appeared for the first time.Then _developed,which became the most important animals on the earth for millions
24、of years.After they disappeared,_ became more important.Text RetellinginsectsamphibiansreptilesdinosaursmammalsThey were the last group of animals and they were different because they _ their young from within their bodies.Small clever animals,with hands and feet,_ and _ all over the earth.As time w
25、ent by,they covered the earth and have become the most important animals on the planet.Text RetellingproducedappearedspreadQuestions:When did the“Big Bang”happen?What was the earth like after the“Big Bang”?What made up the earths atmosphere?How did water come into being on the earth?What was important to the development of fish?What made possible the rise of mammals on the earth?Why are mammals different from all life forms in the past?试一试
Copyright@ 2020-2024 m.ketangku.com网站版权所有