题目内容：
Questionsarebasedonthefollowingpassage:
Alawyerfriendofminehasdevotedherselftotheserviceofhumanity．Herspecialareaiscalled"publicinterestlaw"．
Manyotherlawyersrepresentonlyclientswhocanpayhighfees．Alllawyershavehadexpensiveandhighlyspecializedtraining,andtheyworklong,difficulthoursforthemoneytheyearn．Butwhathappenstopeoplewhoneedlegalhelpandcannotaffordtopaytheselawyers'fees?
Publicinterestlawyersfillthisneed．Lisa,likeotherpublicinterestlawyers,earnsasalarymuchbelowwhatsomelawyerscanearn．Becausesheiswillingtotakelessmoney,herclientsneedthehelp,eveniftheycanpaynothingatall．
Someclientsneedlegalhelpbecausestoreshavecheatedthemwithfaultymerchandise．Othersareinunsafeapartments,orarethreatenedwitheviction(驱逐，赶出)andhavenoplacetogoto．Theircasesarecalled"civil"cases．Stillothersareaccusedofcriminalacts,andseekingthosepublicinterestlawyerswhohandle"criminal"cases．Thesearejustafewofthemanysituationsinwhichmenandwomenwhoarepublicinterestlawyersservetoextendjusticethroughoutoursociety．
Apersonwhoneedsanduseslegalhelpiscalleda（ ）． A．lawyer
B．client
C．tenant
D．caseworker
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答案解析：