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八下学案Module3Unit2Read Choosethe bestanswer.
1.Scientists thinkthat therehas beenlife onEarth foryears,of B.millions ofC.billions ofHavewe foundlife onother planetsA.Yes,we have.B.No,not yet.C.No,we haven*t.Read Putthe wordsand phrasesin theorder small---bigearth,universe,Milky Way,solar systemCompletethe sentences.The earthis a.The sunis a.The sunand itseight planetsare called.Our galaxyis called.There aremany other galaxies in the.Read4Check thetrueT statements.
1.There ismore thanone galaxyintheuniverse.
2.The lightfrom thestars inothergalaxieshas travelledfor ashort timeto reachus.
3.Spaceships havevisited mostof theuniverse.Read Answerthe twoquestions.anyone discoveredlife inspace
2.Do youknow whetherthere islife inspace ornot。