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1、英语六级阅读模拟练习Plasticsarematerialswhicharesoftenedbyheatandsetintolastingformwhenshapedinamold.Somearenatural;somearesemi-synthetic半合成的,theresultofchemicalactiononnaturalsubstance;somearesynthetic,builtupfromtheconstituentsofoilorcoal.Allarebasedonthechemistryofcarbon,withitscapacityforformingchains.The
2、moleculesthatcomposethemmonomerslinktogetherinthesettingorcuring硫化processtoformchainspolymers,whichgiveplasticstheirflexiblestrength.Someplasticsretaintheirabilitytobesoftenedandreshaped;likewax,theyarethermoplastic.Otherssetpermanentlyintheshapestheyaregivenbyheatandpressure;likeeggs,theyarethermos
3、etting.Fromindustrialbeginningsinthenineteenthcentury,plasticshavestruggledthroughahundredandtwentyyearsofglory,failure,disreputeandsuspicionontheslowroadtopublicacceptance.Now,atlast,onecanpositivelysaythatplasticsareappreciatedandenjoyedforwhattheyare;thattheymakemodernlifericher,morecomfortablean
4、dconvenient,andalsomorefun.Plasticsarewarmmaterials,sympathetictothehumantouch,andtheirtransformationintothingsthatcomeintocontactwithhumanbeingsisentirelyappropriate.Thefactthatthereareplasticantiquescomesasashocktomostpeople.Howcanamaterialthatseemssoessentiallytwentiethcentury,andonethatissomucha
5、ssociatedwithcheap,disposableproducts,hasahistoryatall?Itisayoungtechnology,andagreatpartofthefunofcollectingplasticsisthatbeautifulpiecesofhistoricalinterestcanstillbefoundverycheaply.21. Theword"sympathetic,inParagraph2mostprobablymeans.A.harmfulB.agreeableC.pitifulD.sorry22. Itcanbeconcluded
6、fromthispassagethat.A. plasticsaresyntheticmaterialsB. plasticswonpublicacceptance120yearsagoC. plasticsareveryharmfulinmodernlifeD. plasticsarecheapasantiques23. Whichofthefollowingisessentialtocreateanytypeofplastics?A.Carbon.B.Eggs.C.Oil.D.Coal.24. Plasticsthathardenintopermanentshapesarecalled.A
7、.chainedB.thermoplasticC.syntheticD.thermosetting25. Whichofthefollowingisthebesttitleforthepassage?A. TheImportanceofPlasticsintheNineteenthCentury.B. WhyPeopleAreSuspiciousofPlastics.C. TheDevelopmentofPlasticsasaModernMaterial.D. HowPlasticsAreManufactured.21.B22.D23.A24.D25.CIntoday'sworld,i
8、nsuranceplaysavitalroleintheeconomicandsocialwelfareoftheentirepopulation.Thewishtoguardagainstdangerstolifeandpropertyisbasictohumannature.Byusingvariouskindsofinsurance,societyhasbeenabletoreducetheeffectsofsuchhazards.Nowhereisinsurancemoreimportantthaninthemanagementofabusiness.Inmanyinstances,l
9、ossesinasmallfirmcanmeanthedifferencebetweengrowthandfailure,vitalityandstagnation停滞.Veryfewsmallbusinesseshaveevenaportionofthefinancialresourcesavailabletolargerenterprises.Frequently,theymustoperateonaveryslightmarginiftheyhopetostayinbusiness.Andthus,theyareparticularlysensitivetounexpectedlosse
10、s.Withoutenoughinsurance,whathappenstosuchafirmwhentheownerdiesorissuddenlydisabled?Whenafirebreaksoutanddestroysthefirm'sbuildingorstock?Whenanemployeeisfoundtohavestolencompanyfunds?Whenacustomerisawardedaliabilityjudgmentforanaccident?Toooften,thebusinessisforcedtothewall,itsfutureoperationsd
11、rasticallycurbed;sometimes,itisdamagedbeyondrepair,itsabilitytocontinuecompletelycrushed.Almostalways,asmallbusinessmanwouldfinditimpossibletohandlethefullburdenofhispotentialrisk.Theamountofmoneyhewouldhavetosetasidetocoverpossiblelosseswouldleavehimnothing,oralmostnothing,torunhisbusinesswith.Iflo
12、ssweretooccurwhichhecouldrepairbyusinghisreservefund,whatassurancewouldhehavethatanotherloss-thesamekindordifferent-mightnotoccurnextweek,nextmonth?Butthenhewouldhavenoreservefundandlittlelikelihoodofstayinginbusinessatall.26. Thisselectiondealsmainlywith.A. therelationbetweeninsuranceandsocietyB. a
13、ccidentsandlossesC. businessfailuresD. theimportanceofinsurancetobusiness27. InParagraph3,“forcedtothewall'meansA.driventodespairB.stayinginastrongpositionC.doingwellD.climbingup28. Theauthorthinksthat.A. accidentsalwayshappenB. abusinessmanshouldtakerisksC. businessesshouldhaveadequateinsuranceD. insuranceisasocialwelfareproject29. AdequateinsurancewilldoallofthefollowingEXCEPTthatitwillA.freesomebusinessfundsB.addtobenefi
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