Therehavebeenmanyinventionswhichhavechangedthewaywelive.Thefirstinventionwasonethatisstillveryimportant--thewheel.Thismadeiteasiertocarryheavythingsandtravellongdistances.
Forhundredsofyearsafterthattherewerefewinventionsthathadasmucheffectasthewheel.Thenintheearly1800stheworldstartedtochange.Therewaslittleunknownlandleftintheworld.Peopledidn'thavetoexplore（探险）muchanymore.Theybegantoworkinsteadtomakelifebetter.
Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.Amongthemwerethecameratheelectriclightandtheradio.Theseallbecameabigpartofourlifetoday.
Thefirstpartofthe20thcenturysawmoregreatinventions:soundfilmin1926thecomputerin1928andjetplanesin1930.Thiswasalsoatimewhenanewmaterial（材料）wasfirstmade.Nylon（尼龙）cameoutin1935.Itchangedthekindofclothespeoplewear.
(1)Thefirstgreatinventionintheworldwasthe________.
[]
A．radio
B．wheel
C．computer
D．electriclight
(2)Beforethe19thcenturytherewere________inventionswhichhadasmucheffectasthewheel.
[]
A．few
B．afew
C．alotof
D．quiteanumberof
(3)Intheearly1800speoplebegantoworkinorderto________.
[]
A．exploremuchmore
B．makelifebetter
C．discovernewland
D．makediscoveries
(4)Anewmaterialwhichchangedourclothescameoutnearlyatthesametimeas________.
[]
A．radios
B．cameras
C．soundfilm
D．jetplanes
(5)Thewriterwantstotellusmainlyabout________.
[]
A．whenthewheelwasinvented
B．whatwereinventedinthe19thcentury
C．howinventionsaffectpeople'slife
D．whatistheresultoftheinventions
