英语六级阅读模拟练习

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