[单选]  二、阅读理解：阅读下面的短文，根据文章内容从A、B、C三个选项中选出一个最佳选项。   Aletterofinvitationiswrittentoinvitepeopleforabusinesseventorpersonaloccasion.Thelettershouldbeshortandclear.Asoftandpolitetoneshouldbeused.Aninvitationlettershouldhavethedate,timeandtheevent.Alwayssendtheletterofinvitationinadvance.Youneedtoletpeopleknowaboutatleastaweekbeforetheeventsothattheycanplantocometotheevent.   Let'stakealookatsomestepsthatwillhelpyououtlinealetterofinvitation:   Begintheletterwithnameandaddressofsenderandreceiver.Notethedate.   Startthemainbodyoftheletterwithsalutations,awordlike“Dear”followedbythereceiver'sname.   Givetheeventinthefirstparagraph.   Putrelevantfactslikedate,timeandplaceoftheeventinthebeginning.   Makethatthereceiversknowthewaytotheplace.   Letthereceiversknowthattheyhavetonoticetheinviterswhethertheywilljointheeventornotbeforeacertaindate.Theletterwillnotewiththedetailsofacontactpersontoconfirmtheirattendancefortheevent. What'sthepurposeofwritingaletterofinvitation?   A.Toinvitepeopleforabusinessevent.B.Toinvitepeopleforapersonaloccasion.C.EitherAorB.2.Whichisnotnecessarywhenwritingaletterofinvitation？    A.dateB.weatherC.place3.Theletterofinvitationshouldnotbe    .A.shortB.easyC.clear4.Whyshouldwesendtheletterofinvitationinadvance?   A.Becausetheinvitationisimportant.B.Becausethereceiverwillneedtoplantocometotheevent.C.Becausethereceiverwillforgettocometotheevent.5.Whichmightbethetitleofthewholepassage?     A.Howtowritealetterofinvitation B.Theimportanceofwritingainvitationletter CThepurposeofwritingainvitationletter