大学英语a4new

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1、大学英语A4一、阅读理解1、Takeanylongpieceofpaper.Nowglue（粘）theendsofthepapertogether.Youhavemadearing.　　Takeasecondlongpieceofpaper.Twistthepaperonceandgluetheendstogether.NowyouhavemadeaMobiusband（带子）.Forpeoplestudyingmaths,thisbandisuncommon.　　Thisstrangebandwasfirstmadeinthe1800sbyaGermanmanname

2、dAugust.Mobius.Mr.Mobiusstudiedmaths.Hewantedtofindawaytoshowhowthisbandworkswithmaths.Understanditornot,thisbandhasonlyonesurface.Youcanfindthisoutforyourself.　　Ifyoudrawalineonthesurfaceofthepaperbeforeyoutwistandglueit,thelineisonlyononesideofthepaper.Thepaperhastwosurfaces.However,if

3、youdrawalineafteryoumaketheMobiusband,youcanfollowthelinearoundallsidesofthepaper.Inotherwords,theMobiusbandmusthaveonlyonesurface.Itisalsoveryinterestingtoseewhathappenswhenyoucuttheband.IfyoucuttheMobiusbandinhalfoncedownthelineyoudrew,youdonotgettwoMobiusbands.Instead,afteryoucuttheba

4、nd,itturnsintoonelargetwistedring.Then,ifyoucutthisringinhalfalongthemiddleofthebandagain,yougettwoconnected（相连的）Mobiusbands.(1)、WhatisaMobiusband?A：Alongpieceofpaper.B：Apaperringforpeopletowear.C：Ametalringformusic.D：Aninterestingtwistedring.答案：D(2)、WhydidAugustMobiusmakethisring?A：Tohe

5、lpstudyamathsproblem.B：Toshowit'sthesameasothers.C：Toshowtheonlysurfaceofanyband.D：Tofindouthowmanysidesithas.答案：A(3)、Howcanyouchangethetwosurfacesofalongpieceofpaperintoonesurface?A：Gluetheendsofthelongpieceofpaper.B：Cutthetwosurfacesofthepaperintoone.C：Drawalineinthemiddleofthepaper.D：

6、Twistthepaperonceandgluethetwoends.答案：D(4)、WhatdoyougetifyoucuttheMobiusbandalongthemiddle?A：Alongpieceofpaper.B：Twolongpiecesofpaper.C：TwoMobiusbands.　D：Onelargetwistedring.答案：D(5)、WhichofthefollowingisNOTtrue?A：YoucanuseanylongpieceofpapertomakeaMobiusband.B：Anylongpieceofpaperhastwosu

7、rfaces.C：TheMobiusbandwasfirstmadeabouttwohundredyearsago.D：YouhavetodrawalineinthemiddleofthelongpieceofpaperbeforemakingaMobiusband.答案：D2、　　Zeppelins,thebigfloatingairshipsusedtocarrypassengersanddropbombsuntilthe1930s,haven'tbeenseeninAmericanskiesformorethan70years.No