精编美国之音慢速英语听力 4 发展·科学报道PDF电子书下载

PartⅠ 3

Agriculture Report 3

Lesson 1 3

Lesson 2 5

Lesson 3 7

Lesson 4 9

Lesson 5 11

Lesson 6 13

Lesson 7 15

Lesson 8 17

Lesson 9 19

Lesson 10 21

Lesson 11 23

Lesson 12 25

Lesson 13 27

Lesson 14 29

Lesson 15 31

Economics Report 33

Lesson 16 33

Lesson 17 35

Lesson 18 37

Lesson 19 39

Lesson 20 41

Lesson 21 43

Lesson 22 45

Lesson 23 47

Lesson 24 49

Lesson 25 51

Lesson 26 53

Lesson 27 55

Lesson 28 57

Lesson 29 59

Lesson 30 61

PartⅡ Keys 63

PartⅢTapescripts 79

PartⅣTranslations 141