Intheroomof200,manypeopleweresittingtogetherforalesson....
问题详情：Intheroomof200,manypeopleweresittingtogetherforalesson.Theywerewaitingeagerlyforaspeechfromawell-knownspeaker.Afewminuteslater,amiddle-agedmancametotheplatformwithsmileonhisface.Atthattime,the...