Thebicycleisoneofthe__41__yetmostusefulinventionsintheworld.Thesurprisingthingisthatitwasnot__42__earlieralthoughthegreatinventorLeonardoDaVinci (达芬奇) haddrawnpicturesforbicyclesandalsoforflyingmachinesandsome__43__things.Thosethingswerenotproduced__44__longafterhedied.
Apersonridingabicycleuses__45__energy(能源)tomakethebicyclemoveandthereisnopollutionatallwhenyouareriding.Evensoindeveloped__46__mostpeopledon'ttravelorworkbybicycle.It'sbecause __47__carsontheroadsislargerandlarger.Itcertainlybecomes__48__torideabicycle.Asaresultmorepeopleputtheirbicyclesawayandgotowork__49__theircars.Perhapsthebestwaytomakeridingsaferandmorepopularistobuildroadsonlyfor__50__andtomakeitdifficultandexpensivefordriverstodrivetheircarsintothecity.
41.A.simple B.simpler C.simplest D.moresimple
42.A.invent B.inventing C.invention D.invented
43.A.other B.another C.others D.theother
44.A.until B.when C.since D.after
45.A.much B.no C.quitealotof D.verylittle
46.A.world B.countries C.land D.villages
47.A.thenumberof B.anumberof C.thiskindof D.manykindsof
48.A.safer B.moredangerous C.muchdangerous D.morewonderful
49.A.by B.use C.in D.riding
50.A.buses B.cars C.trains D.bicycles
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