21世纪大学实用英语综合练习 4PDF电子书下载

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Unit 1 1

Part Ⅰ Text Exercises 1

Part Ⅱ Exercises for PRETCO 10

Unit 2 19

Part Ⅰ Text Exercises 19

Part Ⅱ Exercises for PRETCO 27

Unit 3 36

Part Ⅰ Text Exercises 36

Part Ⅱ Exercises for PRETCO 45

Unit 4 53

Part Ⅰ Text Exercises 53

Part Ⅱ Exercises for PRETCO　 63

Test yourseef（for Units 1-4）　 72

Unit 5 80

Part Ⅰ Text Exercises 80

Part Ⅱ Exercises for PRETCO 89

Unit 6 98

Part Ⅰ Text Exercises 98

Part Ⅱ Exercises for PRETCO 106

Unit 7 115

Part Ⅰ Text Exercises 115

Part Ⅱ Exercises for PRETCO 124

Unit 8 132

Part Ⅰ Text Exercises 132

Part Ⅱ Exercises for PRETCO 140

Test yourseef（for Units 5-8） 149

Test yourseef（for PRETCO—Level A） 157

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