Unit13 Albert Einstein 1
Lesson49 1
Lesson50 3
Lesson51 5
Lesson52 7
Unit14 Satellites 9
Lesson53 9
Lesson54 11
Lesson55 13
Lesson56 15
Unit15 A famous detective 17
Lesson57 17
Lesson58 19
Lesson59 21
Lesson60 23
Unit16 The sea 25
Lesson61 25
Lesson62 27
Lesson63 29
Lesson64 31
Unti17 Life in the future 33
Lesson65 33
Lesson66 35
Lesson67 37
Lesson68 39
Unit18 Mainly revision 41
Lesson69 41
Lesson70 43
Lesson71 45
Lesson72 47
Lesson73 49
Unit19 A freedom fighter 49
Lesson74 51
Lesson75 53
Lesson76 55
Unit20 Disability 57
Lesson77 57
Lesson78 59
Lesson79 61
Lesson80 63
Unit21 Music 65
Lesson81 65
Lesson82 67
Lesson83 69
Lesson84 71
Lesson85 73
Unit22 A tale of two cities 73
Lesson86 75
Lesson87 77
Lesson88 79
Unit23 Telephones 81
Lesson89 81
Lesson90 83
Lesson91 85
Lesson92 87
Unit24 Mainly revision 89
Lesson93 89
Lesson94 91
Lesson95 93
Lesson96 95
期中测试 97
期末测试 105
参考答案 113