Unit 13 Albert Einstein 1
Unit 14 Satellites 22
Unit 15 A Famous detective 43
Unit 16 The sea 64
Unit 17 Life in the future 86
Unit 18 Mainly revision 106
期中模拟试卷 126
Unit 19 A freedom fighter 145
Unit 20 Disability 162
Unit 21 Music 179
Unit 22 A tale of two cities 195
Unit 23 Telephones 212
Unit 24 Mainly revision 229
期末模拟试卷 246
参考答案 265