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1、Unit16 ScientistsatworkⅠ.TeachingGoals:1.Thinkandtalkaboutscienceandscientists.2.Learnhowtogiveinstructions.3.Studyrulesofwordformation.4.Learntowriteanargumentativeessay.Ⅱ.TeachingTime:FourperiodsⅢ.BackgroundInformation：1.GreatInventions偉大發(fā)明Therehavebeenmanygreatinventions,thingsthatchangedtheway
2、welive.Thefirstgreatinventionwasonethatisstillveryimportanttoday—thewheel.Thismadeiteasiertocarryheavythingsandtotravellongdistances.Forhundredsofyearsafterthat,therewerefewinventionsthathadasmucheffectasthewheel.Thenintheearly1800'stheworldstartedtochange.Therewaslittleunknownlandintheworldpeople
3、didnothavetoexploremuchanymore.Theybegantoworkinsteadtomakelifebetter.Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.Amongthemwerethecamera,theelectriclightandtheradio.Theseallbecameabigpartofourlifetoday.Thefirstpartofthe20thcenturysawmoregreatinventions:thehelicopterin1909;moveswiths
4、oundin1926;thecomputerin1928;andjetplanesin1930.Thiswasalsoatimewhenanewmaterialwasfirstmade.Nylohcameoutin1935.Itchangedthekindofclothespeoplehadbeenwearing.Themiddlepartofthe20thcenturybroughtnewwaystohelppeoplegetoverdiseases.Theyworkedverywell.Theymadepeoplehealthierandletthemlivelongerlives.B
5、ythe1960'smostpeoplecouldexpecttoliveatleast60.Bythistimemostpeoplehadaverygoodlife.Ofcoursenewinventionscontinuedtobemade.Butmannowhadadesiretoexploreagain.Theworldwasknowntomanbutthestarswerenot.Manbeganlookingforwaystogointospace.Russiamadethefirststep.ThentheUnitedStatestookastep.Sincethenothe
6、rcountries,includingChinaandJapan,havemadetheirstepsintospace.In1969mantookhisbiggeststepawayfromtheearth.Americansfirstwalkedonthemoon.Thisiscertainlyjustabeginningthought.Newinventionswillsomedayallowustodothingswehaveneverdreamedof.2.TheFirstPlanes最早的飛機Steamengineswerefirsttobetriedinplanes,but
7、theyweretooheavytobereallyuseful.In1884,suchamachinewasmade,whichconsistedofalargenumberofwingsoneabovetheotherandwasdrivenbyasteamengine.Itissaidthatitroseforamomentofftheground.Anotherrose,butfellandwasdamaged.
