学习参考：词语注释·课文注释·参考译文PDF电子书下载

目录 1

Lesson 1 1

Lesson 2 1

Lesson 3 2

Lesson 4 3

Lesson 5 4

Lesson 6 5

Lesson 7 6

Lesson 8 7

Lesson 9 8

Lesson 10 9

Lesson 11 10

Lesson 12 11

Lesson 13 12

Lesson 14 13

Lesson 15 13

Lesson 16 14

Lesson 17 15

Lesson 18 16

Lesson 19 17

Lesson 20 18

Lesson 21 18

Lesson 22 19

Lesson 23 20

Lesson 24  20

Lesson 25 21

Lesson 26 22

Lesson 27 23

Lesson 28 23

Lesson 29 24

Lesson 30 25

Lesson 31 26

Lesson 32 27

Lesson 33 29

Lesson 35 30

Lesson 34 30

Lesson 36 32

Lesson 37 32

Lesson 38 33

Lesson 39 34

Lesson 40 35

Lesson 41 36

Lesson 42 37

Lesson 43 38

Lesson 44 39

Lesson 45 40

Lesson 46 41

Lesson 47 42

Lesson 48 43

Lesson 49 44

Lesson 50 45

Lesson 51 46

Lesson 52 47

Lesson 53 48

Lesson 54 49

Lesson 55 51

Lesson 56 52

Lesson 57 52

Lesson 58 53

Lesson 59 54

Lesson 60 55

Lesson 61 56

Lesson 62 57

Lesson 63 58

Lesson 64 59

Lesson 65 60

Lesson 66 61

Lesson 67 62

Lesson 68 64

Lesson 69 65

Lesson 70 66

Lesson 71 66

Lesson 72 67

Lesson 73 68

Lesson 74 69

Lesson 75 70

Lesson 76 71

Lesson 77 72

Lesson 78 73

Lesson 79 73

Lesson 80 74

Lesson 81 75

Lesson 82 76

Lesson 83 77

Lesson 84 78

Lesson 85 78

Lesson 86 80

Lesson 87 80

Lesson 88 81

Lesson 89 81

Lesson 91 83

Lesson 90 83

Lesson 92 85

Lesson 93 85

Lesson 94 86

Lesson 95 87

Lesson 96 89

Lesson 97 89

Lesson 98 91

Lesson 99 91

Lesson 100 92

Lesson 101 93

Lesson 102 94

Lesson 103 95

Lesson 104 96

Lesson 105 97

Lesson 106 98

Lesson 107 98

Lesson 108 99

Lesson 109 100

Lesson 110 101

Lesson 111 102

Lesson 112 103

Lesson 113 104

Lesson 114 105

Lesson 115 106

Lesson 116 107

Lesson 117 108

Lesson 118 109

Lesson 119 109

Lesson 120 110

Lesson 121 111

Lesson 122 112

Lesson 123 113

Lesson 124 114

Lesson 125 115

Lesson 127 116

Lesson 126 116

Lesson 129 118

Lesson 128 118

Lesson 130 120

Lesson 131 120

Lesson 132 121

Lesson 133 122

Lesson 134 123

Lesson 135 123

Lesson 137 125

Lesson 136 125

Lesson 138 127

Lesson 139 127

Lesson 140 129

Lesson 141 129

Lesson 142 130

Lesson 143 131

Lesson 144 132