题目内容：
Questionsarebasedonthefollowingpassage. Therehavebeenmanygreatinventions,thingsthatchangedthewaywelive．Thefirstgreatinventionwasonethatisstillveryimportanttoday--thewheel．Thismadeiteasiertocarryheavythingsandtotravellongdistances．Forhundredsofyearsafterthattherewerefewinventionsthathadasmucheffectasthewheel．Thenintheearly1800'stheworldstartedtochange．Therewaslittleunknownlandleftintheworld．Peopledidnothavetoexploremuchanymore．Theybegantoworkinsteadtomakelifebetter．Inthesecondhalfofthe19thcenturymanygreatinventionsweremade．Amongthemwerethecamera,theelectriclightandtheradio．Theseallbecameabigpartofourlifetoday.
Thefirstpartofthe20thcenturysawmoregreatinventions．Thehelicopterin1909.Movieswithsoundin1926．Thecomputerin1928．Andjetplanesin1930．Thiswasalsoatimewhenanewmaterialwasfirstmade．Nyloncameoutin1935．Itchangedthekindofclothespeoplewear．Themiddlepartofthe20thcenturybroughtnewwaystohelppeoplegetoverdisease．Theyworkedverywell．Theymadepeoplehealthierandletthemlivelongerlives．Bythe1960'smostpeoplecouldexpecttolivetobeatleast60．Bythistimemostpeoplehadaverygoodlife．Ofcoursenewinventionscontinuedtobemade．Butmannowhadadesiretoexploreagain．Theworldwasknowntomanbutthestarswerenot.
Manbeganlookingforwaystogointospace．Russiamadethefirststep．ThentheUnitedStatestookastep．Sincethenothercountries,includingChinaandJapan,havemadetheirstepsintospace．In1969mantookhisbiggeststepawayfromearth．Americansfirstwalkedonthemoon．Thisiscertainlyjustabeginningthough．Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
Whatwasthefirstgreatinvention? A．Thewheel.
B．Movies．
C．Thecamera.
D．Nylon.
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