单项选择题
PassageTwo
Questions26to30arebasedonthefollowingpassage.
FalseteethhavebeenfoundinItalyinhumanheadsthatareover2，500yearsold.Theyweremadeofboneandsetingold.However，forhundredsofyearsafterwards，theapparentdentalskillofthoseearlypeoplewaslost.Withoutfalseteethpeoplelookedoldbeforetheirtime，sincesomanylosttheirteethatanearlyage.
Towardtheendofthe17thcentury，richpeoplecouldbuyfalseteethmadefromivory.Theteethweretiedtogetherwithsilkthread，butitwasdifficulttokeeptheminthemouth.Thatwaswhyrichpeoplewouldratherbuyteethfromthepoorwhowouldoftenselltheirteethtobuyfoodandclothing.
Earlyinthe18thcenturyaFrenchdoctorusedsteelspringstoholdteethinplace.However，itwasdifficulttocloseone‘smouth！Lateinthesamecenturyporcelain（瓷）teethsetingoldwereoftenusedtomakefalseteeth.
Althoughtheuseofartificialteethincreased，humanteethcontinuedtobeusedalso.Inthe19thcentury，teethfromsoldierskilledinbattleweremadeintoartificialteeth.Forexample，teethfromthedeadintheAmericanCivilWarweresenttoEngland.
Bythemiddleofthe19thcentury，anAmericandoctor，ClaudiusAsh，inventedabetterkindofporcelaintoothmadeofaspecialkindofhardrubber. Whofirstusedsteelspringstotiefalseteethtogetheraccordingtothepassage？
A．An Italian doctor.
B．A French doctor.
C．An American doctor.
D．An English doctor.