Unit 11 Scientific achievements 1
Unit 12 Fact and fantasy 9
Unit 13 The water planet 17
Unit 14 Freedom fighters 25
Unit 15 Destinations 33
期中测试题 41
Unit 16 The United States of America 51
Unit 17 Disabilities 59
Unit 18 Inventions 67
Unit 19 The Merchant of Venice 75
Unit 20 Archaeology 84
期末测试题 92
参考答案 102
听力材料 111