Reading:HowlifebeganontheearthGoal:Methods:ReadinganddiscussingScanning

Scanthepassageandfindouttheanswertothequestion:Whendidhumanbeingsappear?ScanningQ:Whendidhumanbeingsappear?A:About2.6millionyearsago.About2.6millionyearsago,humanbeingsappeared.?4.6billionyearsagoSkimming

Readthepassagecarefullyandfindoutthemainideaforeachparagraph.

Para.1Para.2Para.3Para.4Para.5Theuniversebeganwitha___________.“BigBang”.Para1SkimmingPara.1Para.2Para.3Para.4Para.5Awidelyacceptedtheoryabouttheformationoftheuniverse.Para1SkimmingReadPara2andtrytoanswerthefollowingquestion:AftertheBigBang,whathappened?Para2a

cloud

of

dust

asolidballatmosphere

54settledinto

cooleddown

填動(dòng)詞Para2______________fireandrockexplodedwith

______________

watervaporandgases123______________produced______________water______________appearedSkimmingPara.1Para.2

Para.3Para.4Para.5Awidelyacceptedtheoryabouttheformationoftheuniverse.Theformationoftheearth.Para2Whatdidthewaterdo?Itallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.Para3SkimmingPara.1Para.2Para.3Para.4Para.5Awidelyacceptedtheoryabouttheformationoftheuniverse.Theformationoftheearth.Theimportanceofwaterforlife.Para31.2.3.4.__________(onland)5.6.7._________8.___________(onland)9._________small________inwater_________andallsortsoffishgreenplantsonland_____________(onlandandinwater)forests

(onland)

(onland)plantsshellfishamphibiansreptilesmammalsPara4insectsdinosaursSkimmingPara.1Para.2Para.3Para.4

Para.5Awidelyacceptedtheoryabouttheformationoftheuniverse.Theformationoftheearth.Theimportanceofwaterforlife.Thedevelopmentofplantsandanimalsontheearth.Para4Humanbeingsappearedandspread.Para5

Theyareputtingtoomuch___________intotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.carbondioxideWhatmainproblemiscausedbyhumanbeings?

Para5Theycauseglobalwarming.SkimmingPara.1Para.2Para.3Para.4Para.5Awidelyacceptedtheoryabouttheformationoftheuniverse.Theformationoftheearth.Theimportanceofwaterforlife.Thedevelopmentofplantsandanimalsontheearth.Thearrivalofhumansandtheirimpactontheearth.Para51073849615212111.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust.9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared.2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth.10.Theuniversebeganwitha"BigBang".12.Mammalsappeared.Puttheorderofthedevelopmentintoatimeline.DiscussionwaterWhatcanwedotoprotecttheearth?forests

animalspla