Unit 11 Scientific achievement 1
Unit 12 Fact and fantasy 15
Unit 13 The water planet 31
Unit 14 Freedom fighters 49
Unit 15 Destinations 66
期中测试题 82
Unit 16 The United States of America 91
Unit 17 Disabilities 108
Unit 18 Inventions 121
Unit 19 The Merchant of Venice 136
Unit 20 Archaeology 151
期末测试题 164
参考答案 174