Unit 11 Scientific achievement 1
Unit 12 Fact and fantasy 13
Unit 13 The water planet 23
Unit 14 Freedom fighters 38
Unit 15 Destinations 49
Unit 16 The United States of America 62
Unit 17 Disabilities 75
Unit 18 Inventions 84
Unit 19 The Merchant of Venice 95
Unit 20 Archaeology 107
期中测试 118
期末测试 126