12月英语六级口试必备范文

xx年12月英语六级口试必备范文四六级口语相对于笔试来说更容易出错并且补救的措施和时机也要少得多，所以考生选择口试后一定要一次发挥好，以下是网的关于口试必备范文，供大家备考。pricesdeterminehowresourcesaretobeused.theyarealsothemeansbywhichproductsandservicesthatareinlimitedsupplyarerationedamongbuyers.thepricesystemoftheunitedstatesisaplexworkposedofthepricesofalltheproductsboughtandsoldintheeconomyaswellasthoseofamyriadofservices,includinglabor,professional,transportation,andpublic-utilityservices.theinterrelationshipsofallthesepricesmakeupthe“system”ofprices.thepriceofanyparticularproductorserviceislinkedtoabroad,plicatedsystemofpricesinwhicheverythingseemstodependmoreorlessuponeverythingelse.ifoneweretoaskagroupofrandomlyselectedindividualstodefine“price”,manywouldreplythatpriceisanamountofmoneypaidbythebuyertothesellerofaproductorserviceor,inotherwordsthatpriceisthemoneyvaluesofaproductorserviceasagreeduponinamarkettransaction.thisdefinitionis,ofcourse,validasfarasitgoes.forapleteunderstandingofapriceinanyparticulartransaction,muchmorethantheamountofmoneyinvolvedmustbeknown.boththebuyerandthesellershouldbefamiliarwithnotonlythemoneyamount,butwiththeamountandqualityoftheproductorservicetobeexchanged,thetimeandplaceatwhichtheexchangewilltakeplaceandpaymentwillbemade,theformofmoneytobeused,thecredittermsanddiscountsthatapplytothetransaction,guaranteesontheproductorservice,deliveryterms,returnprivileges,andotherfactors.inotherwords,bothbuyerandsellershouldbefullyawareofallthefactorsthatprisethetotal“package”beingexchangedfortheasked-foramountofmoneyinorderthattheymayevaluateagivenprice.04electricitythemodernageisanageofelectricity.peoplearesousedtoelectriclights,radio,televisions,andtelephonesthatitishardtoimaginewhatlifewouldbelikewithoutthem.whenthereisapowerfailure,peoplegropeaboutinflickeringcandlelight,carshesitateinthestreetsbecausetherearenotrafficlightstoguidethem,andfoodspoilsinsilentrefrigerators.yet,peoplebegantounderstandhowelectricityworksonlyalittlemorethantwocenturiesago.naturehasapparentlybeenexperimentinginthisfieldformillionofyears.scientistsarediscoveringmoreandmorethatthelivingworldmayholdmanyinterestingsecretsofelectricitythatcouldbenefithumanity.alllivingcellsendouttinypulsesofelectricity.astheheartbeats,itsendsoutpulsesofrecord;theyformanelectrocardiogram,whichadoctorcanstudytodeterminehowwelltheheartisworking.thebrain,too,sendsoutbrainwavesofelectricity,whichcanberecordedinanelectroencephalogram.theelectriccurrentsgeneratedbymostlivingcellsareextremelysmall–oftensosmallthatsensitiveinstrumentsareneededtorecordthem.butinsomeanimals,certainmusclecellshavebeesospecializedaselectricalgeneratorsthattheydonotworkasmusclecellsatall.whenlargenumbersofthesecellarelinkedtogether,theeffectscanbeastonishing.theelectriceelisanamazingstoragebattery.itcanseedajoltofasmuchaseighthundredvoltsofelectricitythroughthewaterinwhichitlive.(anelectrichousecurrentisonlyonehundredtwentyvolts.)asmanyasfour-fi