Unit 1 Niagara Falls Unit 2 Health Unit 3 Wht's Your Favorite Sport? Unit 4 Olympic Games Unit 5 Airport Facilities Unit 6 Hotel 綜合練習(xí)一 Unit 7 Popular Culture Unit 8 Clothing Unit 9 Famous People Unit 10 Western Festivals Unit 11 Our World-the Environment Unit 12 Water Supply 綜合練習(xí)二 綜合練習(xí)三 模擬試題 附錄A 參考答案