Unit 3 Grade 8 What were you doing when the UFO arrived? 之 Do you remember what you were doing?By Mr. WangMarch 18, 2005Word studyflightplaygroundbellearthI’m a hero.You’re heroes, too.heroterrorist恐怖分子murder谋杀;凶杀destroy破坏;毁坏kill 杀死;致死World Trade CenterSeptember 11, 2001tragedy悲剧 tusn