如何使用贝壳网教学资源

Unit 1 Section A

Unit 1 Section B

Unit 2 Section A

Unit 2 Section B

Unit 3 Section A

Unit 3 Section B

Unit 4 Section A

Unit 4 Section B

Unit 5 Section A

Unit 5 Section B

Unit 6 Section A

Unit 6 Section B

Unit 7 Section A

Unit 7 Section B

Unit 8 Section A

Unit 8 Section B

Unit 9 Section A

Unit 9 Section B

Unit 10 Section A

Unit 10 Section B

Unit 11 Section A

Unit 11 Section B

Unit 12 Section A

Unit 12 Section B