pAssAgE thrEE quEstions 31 to 35 ArE BAsED on thE Following pAssAgE. trADEmArks (商标) iDEntiFy AnD Distinguish thE proDuCts oF onE BusinEss Firm From thosE oF AnothEr. it mAy inCluDE A worD，A sEntEnCE，A nAmE，A symBol，A piCturE，or Any ComBinAtion oF thEsE. trADEmArks must BE AttAChED DirECtly to thE proDuCt. mAny trADEmArks ContAin thE nAmE oF thE ownEr oF thE BusinEss.But mAnuFACturErs oFtEn usE somE worD to DEsCriBE thE quAlitiEs oF thE proDuCt，or mAkE up A worD、thE spokEn pArt oF A trADEmArk is CAllED thE BrAnD nAmE. trADEmArks proviDE A simplE wAy For pEoplE to DEtErminE who is rEsponsiBlE For A pArtiCulAr itEm. thEy Also hElp pEoplE iDEntiFy thE BrAnDs thEy likED in thE pAst so thEy mAy purChAsE thEm AgAin. mAnuFACturErs usE trADEmArks to promotE thE sAlE oF thEir gooDs. sErviCE mArks Also iDEntiFy gooDs AnD sErviCEs. thEy Do not hAvE to BE AttAChED to A proDuCt.CompAniEs thAt proviDE sErviCEs to thE puBliC，suCh As trAnsportAtion CompAniEs，usE thEsE mArks to ADvErtisE thEir sErviCEs. For ExAmplE，A BluE sign with A BEll，thE symBol oF thEAmEriCAn tElEphonE AnD tElEgrAphCompAny，tElls EvEry pAssEr-By thAt A puBliC tElEphonE is AvAilABlE For usE. lAws to protECt thE rights oF thE trADEmArk ownEr wErE DEvElopED in thE EArly 1800’s.most CountriEs now proviDE For rEgulAtion AnD rEgistrAtion oF trADEmArks.An importAnt protECtion For trADEmArk rights is FEDErAl(联邦的)rEgistrAtion. in 1905，thE u.s.CongrEss pAssED thE First FEDErAl lAw on trADEmArk rEgistrAtion to BE hElD ConstitutionAl. wE lEArn From thE sEConD pArAgrAph thAt trADEmArks ArE usEFul in thAt ___________.
A、thEy hElp mAnuFACturErs to Control thE priCEs oF thEir proDuCts
B．thEy oFFEr pEoplE thE inFormAtion ABout mArkEt in A simplE wAy
C、thEy mAkE CustomErs AwArE oF thEir own rEsponsiBility For thE itEms
D．thEy EnABlE CustomErs to purChAsE thE gooDs thEy prEFEr