Therehavebeenmanygreatinventionsorthingsthatchangedthewaywelive.Thefirstgreatinventionwastheone
thatisstillveryimportanttoday——thewheel.Thismadeiteasiertocarryheavythingsandtotravellongdistance.
F．orhundredsofyearsafterthattherewerefewinventionsthatasmucheffectasthewheel.Thenintheearly1800
stheworldstartedtochange.Therewaslittleunknownlandleftintheworld.Peopledidn’thavetoexploremuchanymore.Theybegantoworkinsteadtomakelifebetter.
Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.Amongthemwerethecamera,thelight
andtheradio.Theseallplayabigpartinourdailylifetoday.
Thefirstpartofthe20thcenturysawmoregreatinventions.Thehelicopterin1909,movieswithsoundin1926,the
computerin1928,jetplanesin1930.Thiswasalsoatimewhenanewmaterialwasfirstmade.Nyloncameoutin
1935.Itchangedthekindofclothespeoplewore.
Themiddlepartofthe20thcenturybroughtnewwaystohelppeoplegetoverdiseases.Theyworkedverywell.They
madepeoplehealthierandallowedthemtolivelonger.Bythe1960smostpeoplecouldexpecttolivetobeatleast60.
B．ythistimemostpeopleindevelopedcountrieshadaverygoodlife.Ofcoursenewinventionscontinuedtobemade.
B．utmannowhadadesire(渴望)toexploreagain.Theearthwasknowntomanbutthestarswerenot.Manbeganlookingforwaystogointospace.
Russiamadethefirststep.ThenUnitedStatestookastep.Sincethenothercountries,includingChinaandJapan,
havemadetheirownstepsintospace.
In1969mantookhisbiggeststepawayfromearth.Americansfirstwalkedonthemoon.Thisiscertainlyjustabegin
ning,though.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
61.Thispassagetalksmainlyabout.
A．whycarswereveryimportant
B．whenlightwasinvented
C．howinventionsaffectpeople’sdailylife
D．whichcountrymadethefirststepintospace