大学英语A4VIP免费

大学英语A4一、阅读理解1、Takeanylongpieceofpaper.Nowglue（粘）theendsofthepapertogether.Youhavemadearing.Takeasecondlongpieceofpaper.Twistthepaperonceandgluetheendstogether.NowyouhavemadeaMobiusband（带子）.Forpeoplestudyingmaths,thisbandisuncommon.Thisstrangebandwasfirstmadeinthe1800sbyaGermanmannamedAugust.Mobius.Mr.Mobiusstudiedmaths.Hewantedtofindawaytoshowhowthisbandworkswithmaths.Understanditornot,thisbandhasonlyonesurface.Youcanfindthisoutforyourself.Ifyoudrawalineonthesurfaceofthepaperbeforeyoutwistandglueit,thelineisonlyononesideofthepaper.Thepaperhastwosurfaces.However,ifyoudrawalineafteryoumaketheMobiusband,youcanfollowthelinearoundallsidesofthepaper.Inotherwords,theMobiusbandmusthaveonlyonesurface.Itisalsoveryinterestingtoseewhathappenswhenyoucuttheband.IfyoucuttheMobiusbandinhalfoncedownthelineyoudrew,youdonotgettwoMobiusbands.Instead,afteryoucuttheband,itturnsintoonelargetwistedring.Then,ifyoucutthisringinhalfalongthemiddleofthebandagain,yougettwoconnected（相连的）Mobiusbands.(1)、WhatisaMobiusband?A：Alongpieceofpaper.B：Apaperringforpeopletowear.C：Ametalringformusic.D：Aninterestingtwistedring.答案：D(2)、WhydidAugustMobiusmakethisring?A：Tohelpstudyamathsproblem.B：Toshowit'sthesameasothers.C：Toshowtheonlysurfaceofanyband.D：Tofindouthowmanysidesithas.答案：A(3)、Howcanyouchangethetwosurfacesofalongpieceofpaperintoonesurface?A：Gluetheendsofthelongpieceofpaper.B：Cutthetwosurfacesofthepaperintoone.C：Drawalineinthemiddleofthepaper.D：Twistthepaperonceandgluethetwoends.答案：D(4)、WhatdoyougetifyoucuttheMobiusbandalongthemiddle?A：Alongpieceofpaper.B：Twolongpiecesofpaper.C：TwoMobiusbands.D：Onelargetwistedring.答案：D(5)、WhichofthefollowingisNOTtrue?A：YoucanuseanylongpieceofpapertomakeaMobiusband.B：Anylongpieceofpaperhastwosurfaces.C：TheMobiusbandwasfirstmadeabouttwohundredyearsago.D：YouhavetodrawalineinthemiddleofthelongpieceofpaperbeforemakingaMobiusband.答案：D2、Zeppelins,thebigfloatingairshipsusedtocarrypassengersanddropbombsuntilthe1930s,haven'tbeenseeninAmericanskiesformorethan70years.Now,aCaliforniacompanyplanstobringtheaircraftbacktotheUnitedStates.AirshipVenture－thenameofthezeppelin－arrivedintheBayAreaonSaturday,passingovertheGoldenGateBridgeonitswaytothenewhomeatMoffettField.FifteenfeetlongerthanaBoeing747,thehugeaircraftwillofferridesthatprovideabird's-eyeviewofmanypartsoftheBayAreaonFriday.Itwillhold12passengersandtwocrewmembers.Theticketpriceis$495perpersonforaone-hourride."Itcanhelpyouseetheworldinawaythatyouhaven'texperiencedbefore,"saidBrianHall,whostartedthecompanylastyearwithhiswife."Inthezeppelin,you'reflyinglowandslow.You'regoingatacomfortablepace.You'reseeingthingsthatyouwouldn'tseefromtheroad."ZeppelinswereinventedbyFerdinandvonZeppelinofGermanyinthelate19thcenturytosendcommercialpassengers.TheywerealsousedasmilitarycarriersuntilthestartofWorldWarII.Thezeppelin'sgoldenageendedin1937whentheLZ-129Hindenburg,thelargestoneeverbuilt,caughtfireandburstintoflamesinNewJersey,killing35of97peopleonboard.Butabouttenyearsago,Germancompaniesbegantobuildzeppelinsandofferpassengerrides."Thenewtype,AirshipVenture,cancarrymorethan80,000passengerswithsafety."Hallsaid.HeandhiswifecameupwiththebusinessplanforAirshipVentureabouttwoyearsago.Twomorezeppelins,whichtakeabout18monthstobuild,plantooffertoursfromNewYorktoFloridain2010.Despitethesl...