英语六级试题阅读理解完形填空模拟训练.docx

英语六级试题阅读理解完形填空模拟训练

英语六级试题阅读理解完形填空模拟训练 立志宜思真品格，读书须尽苦功夫。以下是小编为大家搜索整理的英语六级试题阅读理解完形填空模拟训练，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网! 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.agreeable C.pitifulD.sorry 22.Itcanbeconcludedfromthispassagethat_______. A.plasticsaresyntheticmaterials B.plasticswonpublicacceptance120yearsago C.plasticsareveryharmfulinmodernlife D.plasticsarecheapasantiques 23.Whichofthefollowingisessentialtocreateanytypeofplastics?A.Carbon.B.Eggs. C.Oil.D.Coal. 24.Plasticsthathardenintopermanentshapesarecalled_______. A.chainedB.thermoplastic C.syntheticD.thermosettin