Intheroomof200,manypeopleweresittingtogetherforalesson....
問題詳情：Intheroomof200,manypeopleweresittingtogetherforalesson.Theywerewaitingeagerlyforaspeechfromawell-knownspeaker.Afewminuteslater,amiddle-agedmancametotheplatformwithsmileonhisface.Atthattime,the...