1、跟踪导练(四)(2) 阅读地带 A Mostpeoplefeellonelysometimes,butitusuallyonlylastsbetweenafewminutesandafewhours.Thiskindoflonelinessisnotserious.Infact,itisquitenormal.Forsomepeople,though,lonelinesscanlastforyears.Nowresearcherssaytherearethreedifferenttypesofloneliness. Thefir