选择C答案是正确的!

　　A.message的常用用法有：

　　1.animportantideaaboutaproduct,brand,etc.thatacompanytriestocommunicateinitsadvertising

　　2.apieceofinformationproducedautomaticallybyacomputerprogramandshownonacomputerscreen

　　B.notice一般用于四种场合：

　　1.writtenorprintednewsorinformation,usuallyputinapublicplace

　　2.informationorawarninggiveninadvanceofsththatisgoingtohappen

　　3.aformalletterorstatementsayingthatyouwillormustleaveyourjobattheendofaparticularperiodoftime

　　4.aformalletterorstatementsayingthatyouwillormustleaveyourhomeattheendofaparticularperiodoftime

　　C.memo的英文解释是：anofficialnotefromonepersontoanotherorothersinthesameorganization

　　常用：acompany/aninternal/astaffmemo

　　tocirculate/send/writeamemo