【Haveyoueverheardthesaying“AllroadsleadtoRome”?Atonetime,thiswasprettymuchtrue.DuringtheRomanEmpire,lotsofroadswerebuiltinordertomovearmies,sendmessagesbycourier(信使),andmaketradeeasier.Thisconstructio】
Haveyoueverheardthesaying“AllroadsleadtoRome”?Atonetime,thiswasprettymuchtrue.DuringtheRomanEmpire,lotsofroadswerebuiltinordertomovearmies,sendmessagesbycourier(信使),andmaketradeeasier.Thisconstructionworkwentonforfivecenturies!IfalltheroadsbuiltduringtheRomanEmpirewereputtogetherendtoend,theywouldcircletheequatortwice.
ThenetworkofRomanroadswasbegunin312BC.Itwasdemandedthattheroadsbebuiltstrongsothattheywouldnotfalldown.Romansoldiers,supervised(监督)byengineers,laiddowntheroadsinaspecialpatternoflayers.Thefirstlayerwasmadeofsand.Next,thebuildersaddedrocksandrubble.Ontopofthesematerialscamegravel.Onthissolidfoundation,theroadbuildersplacedpavingstones.
Also,Romanroadswerecambered.Thismeansthattheywerebuilthigherinthemiddlethanontheedges,allowingrainwatertorunoff,whichpreventedflooding.Weusethesametechniqueinbuildingroadstoday.TheRomansalsolaidoutroadsoverhillswhennecessary,settingthemdowninazigzagpatterntomaketheroadrisegradually.
AllRomanroadshadmilestones(里程碑),placedeverythousandspaces(aRomanmile).Themilestonestoldwhentheroadwasbuilt,whowasemperoratthetime,theroad’sdestination,howfarthetravelerwasfromthedestination,andhowmanymileshadbeentraveledsincethebeginningoftheroad.Thisinformationwasagreathelptotravelers.
Becauseoftheirexcellenceinconstruction,itreallyisnosurprisethatmanypartsofRomanroadstillexisttoday.TheseroadwaysareoneofthemostimpressiveaccomplishmentsoftheRomanEmpireWhatdoestheunderlinedsentenceinthefirstparagraphmean?WhichofthefollowingcorrectlyshowsthestructureoftheRomanroads?Whatinformationcanyoufindonthemilestones?Thepassagemainly______
A.TheRomanEmpirewasverypowerful
B.LotsofroadswerebuiltduringtheRomanEmpire
C.TheroadsbuiltduringtheRomanEmpirewereverylong
D.TheroadsbuiltduringtheRomanEmpirewereveryconvenient
A.Pavingstones
Gravel
Rocks&rubble
Sand
B.Gravel
Rocks&rubble
Sand
C.Sand
Rocks&a