单元主题1.Friendship 2.English around the world 3.Travel journal 4.Earthquakes 5.Nelson Mandela-a modern hero 6.Cultural relics 7.The Olympic Games 8.Computers 9.Wildlife protection 10.Music 11.Festivals around the world 12.Healthy eating 13.The Million Pound Bank Note 14.Astronomy:the science of the stars15.Canada-\"The True North\"16.Women of achievement 17.Working the land 18.A taste of English humour 19.Body language 20.Theme parks 21.Great scientists 22.The United Kingdom 23.Life in the future 24.Making the news 25.First aid 26.Art27.Poems