Unit 13 Albert Einstein 1
Unit 14 Satellites 19
Unit 15 A famous detective 37
Units 13～15 单元测试 53
Unit 16 The sea 61
Unit 17 Life in the future 83
Unit 18 Mainly Revision 103
Units 16～18 单元测试 121
Unit 19 A freedom fighter 129
Unit 20 Disability 151
Unit 21 Music 175
Units 19～21 单元测试 195
Unit 22 A tale of two cities 203
Unit 23 Telephones 225
Unit 24 Mainly Revision 247
Units 22～24 单元测试 267
期中综合试题 275
期末综合试题 283
参考答案 291