[单选]  二、阅读理解：阅读下面的对话，选择合适的内容将对话补充完整。（教材对话原文）Michael:Theyaretestingthe3Dprinter.Don’tyoucomeandseeit?Lucas:What?Neverheardofit.Michael:Itisoneofthemostlatesttechnological innovations.Lucas:Really?   .Michael:Comeon!Youshouldlearntobe open-minded.Lucas:   Michael:The3Dprintingtechnologycouldbeusedinconstruction,engineering,biomedicine,andmanyotherfields.Itcanprintanything,ahouse,acar,evenaliver!Lucas:Thatcan’tbetrue.Iwillneverbelievethis.Michael:   .Allthese willbeabsolutelycarriedoutby3Dprinters.There’sacompanycalledNaturalMachineshasintroduceda3Dprinterforfoodproducing.Lucas:Iguessthattherearealotofproceduresinvolvedinthisprocess.Sothisprintermustbeverybig.Michael:   .Itcanprintallkindsofdessertandstarter.Lucas:Isitexpensive?Michael:   . A.Itisabout$.1,000B.MaybeitsfunctionsarequestionableC.Itisreallytrue.D.Whatarethemainfunctionsofit?E.Infact,itisasbigasanoven