大学英语六级阅读理解完形填空练习题.docx

大学英语六级阅读理解完形填空练习题大学英语六级阅读理解完形填空练习题英语是现在世界上用的最多的一门语言，许多国家都在学英语和用英语，所以，学好了英语，出门就不怕沟通不方便了。下面是小编为大家搜索整理的英语六级辅导训练，希望能给大家带来帮助!Plasticsarematerialswhicharesoftenedbyheatandsetintolastingformwhenshapedinamold.Somearenatural;somearesemi-synthetic(半合成的),theresultofchemicalactiononnaturalsubstance;somearesynthetic,builtupfromtheconstituentsofoilorcoal.Allarebasedonthechemistryofcarbon,withitscapacityforformingchains.Themoleculesthatcomposethem(monomers)linktogetherinthesettingorcuring(硫化)processtoformchains(polymers),whichgiveplasticstheirflexiblestrength.Someplasticsretaintheirabilitytobesoftenedandreshaped;likewax,theyarethermoplastic.Otherssetpermanentlyintheshapestheyaregivenbyheatandpressure;likeeggs,theyarethermosetting.Fromindustrialbeginningsinthenineteenthcentury,plasticshavestruggledthroughahundredandtwentyyearsofglory,failure,disreputeandsuspicionontheslowroadtopublicacceptance.Now,atlast,onecanpositivelysaythatplasticsareappreciatedandenjoyedforwhattheyare;thattheymakemodernlifericher,morecomfortableandconvenient,andalsomorefun.Plasticsarewarmmaterials,sympathetictothehumantouch,andtheirtransformationintothingsthatcomeintocontactwithhumanbeingsisentirelyappropriate.Thefactthatthereareplasticantiquescomesasashocktomostpeople.Howcanamaterialthatseemssoessentiallytwentiethcentury,andonethatissomuchassociatedwithcheap,disposableproducts,hasahistoryatall?Itisayoungtechnology,andagreatpartofthefunofcollectingplasticsisthatbeautifulpiecesofhistoricalinterestcanstillbefoundverycheaply.21.Theword"sympathetic"inParagraph2mostprobablymeans_______.A.harmfulB.agreeableC.pitifulD.sorry22.Itcanbeconcludedfromthispassagethat_______.A.plasticsaresyntheticmaterialsB.plasticswonpublicacceptance120yearsagoC.plasticsareveryharmfulinmodernlifeD.plasticsarecheapasantiques23.Whichofthefollowingisessentialtocreateanytypeofplastics?A.Carbon.B.Eggs.C.Oil.D.Coal.24.Plasticsthathardenintopermanentshapesarecalled_______.A.chainedB.thermoplasticC.syntheticD.thermosetting25.Whichofthefo