Unit 11 Scientific achievement 1
Unit 12 Fact and fantasy 13
Unit 13 The water planet 23
Unit 14 Freedom fighters 34
Unit 15 Destinations 44
期中考试试卷 54
Unit 16 The United States of America 64
Unit 17 Disabilities 75
Unit 18 Inventions 85
Unit 19 The Merchant of Venice 95
Unit 20 Archaeology 106
期末考试试卷 116
参考答案·解题点拨 126