参考答案

正确答案：B
[听力原文][26]Todaywearegoingtopracticeevaluatingamaintoolusedwhenaddressinggroups-thevoice.Therearethreemainelementsthatcombinetocreateeitherapositiveornegativeexperienceforlisteners.Theycanresultinavoicethatispleasingtolistentoandcanbeusedeffectively.Ortheycancreateavoicethatdoesntholdattention.Thethreeelementsarevolume,pitchandpace.Whenevaluatingvolume,keepinmindthatagoodspeakerwilladjusttothesizeofboththeroomandtheaudience.Ofcourse,withanamplifyingdevicelikeamicrophone,thespeakercanuseanaturaltone.Butspeakersshouldnotbedependentonmicrophones.[27]Agoodspeakercanspeakloudlywithoutshouting.Thesecondelement,pitch,isrelatedtothehighnessorlownessofthesounds.Highpitchesareformostpeoplemoredifficulttolistento.So,ingeneral,speakersshouldusethelowerregistersoftheirvoice.Duringapresentation,itsimportanttovarypitchtosomeextentinordertomaintaininterest.Thethirdelement,pace-thatishowfastorslowwordsandsoundsarepronounced-shouldalsobevaried.Aslowerpacecanbeusedtoemphasizeimportantpoints.Notethatthetimespentnotspeakingcanbemeaningfultoo.[28]Pausesoughttobeusedtosignaltransitiousorcreateanticipation.Becauseapausegivesthelistenertimetothinkaboutwhatwasjustsaidoreventopredictwhatmightcomenext.Itcanbeveryeffectivewhenmovingfromonetopictoanother.26.Whatisthemainpointthelecturermakes?27.Whatrecommendationdoesthelecturermakeaboutvolume?28.Accordingtothelecturer,howcanaspeakerindicatethatthetopicisabouttochange?B【解题思路】比较四个选项大致可以推测本题问的是本文的主要内容。【解析】短文开头即说明了短文的主要内容：评价演讲时最主要的工具——声音，并分三个要素加以分析，脉络很清晰。因此答案为B。