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1、综合题，请根据题目给出的内容，來冋答下面给出的试题。Plasticsarematerialswhicharesoftenedbyheatandsetintolastingfromwhenshapedinamold.Somearenatural;somearesemisynthetic,theresultofchemicalactiononanaturalsubstance;somearesynthetic,builtupfi*omtheconstituentsofoilorcoal.Allarebasedonthechemistryofcarbon,withitscapacityforform
2、ingchains.Themoleculesthatcomposethem（monomers）linktogetherinthesettingorcuring（固化）processtoformchains（polymers）,whichgiveplasticstheirflexiblestrength.Someplasticsretaintheirabilitytobesoftenedandreshaped;likewax,theyarethermoplastic.Otherssetpermanentlyintheshapestheyaregivenbyheatandpressure;like
3、eggs,theyarethermosetting.Fromindustrialbeginningsinthenineteenthcentury,plasticshavestruggledthroughahundredandtwentyyearsofglory,failure,disrepute（坏名声）andsuspicionontheslowroadto.Now,atlast,onecanpositivelysaythatplasticsareappreciatedandenjoyedforwhattheyare;thattheymakemodernlifericher,morecomfo
4、rtableandconvenientandalsomorefunny.Plasticsarewarmmaterials,sympathetictothehumantouch,andtheirtransformationintothingsthatcomeintocontactwithhumanbeingsisentirelyappropriate.Thefactthatthereplasticantiquescomesasashocktomostpeople・Howcanamaterialthatseemssoessentialinthetwentiethcentury,andonethat
5、issomuchassociatedwithcheapdisposableproducts,haveahistroyatall?Itisayoungtechnology,andagreatpartofthefunofcollectingplasticsisthatbeautifulpiecesofhistoricalinterestcanstillfoundverycheaply.请根据上面给出的内容，来冋答下面的单项选择题（下列每小题备选答案中，只有一个符合题意的正确答案。每小题0分，共5题。）16.Whichofthefollowingisthebesttitleforthepassage
6、?A:TheImportanceofPlasticsintheNineteenthCenturyB:WhypeopleAreSuspiciousofPlasticsC:ThedevelopmentofPlasticsasaModernMaterialD:HowPlasticsAreMaterial请选择答案：A:B:C:D:17.Whichofthefollowingisnecessarytocreateanytypeofplastics?A:Carbon.B:Oil.C:Eggs.D:Coal.请选择答案：A:B:C:D:18.Accordingtotheauthor,forapproxim
7、atelyhowmanyyearshaveplasticsexisted?A:100B:120C:140D:160请选择答案：A:B:C:D:19.Whathistoricalinformationdoesthesecondparagraphgiveaboutplastics?A:Theyoriginatedprimarilyasroad-surfacingmaterials.B:Theyhave
