资源包含：

All 5 Levels (PDFs Resources)

C21 2nd Level 1-2 Academic Skills 学术技能
C21 2nd Level 3-4 Academic Skills

Level 1 (A1)
C21 2nd Level 1 Audio 音频
C21 2nd Level 1 Coursebook.pdf 学生书
C21 2nd Level 1 Slideshows 视频
C21 2nd Level 1 Teacher’s Book.pdf 教师书
C21 2nd Level 1 Workbook.pdf 练习册

Level 2 (A1+)
C21 2nd Level 2 Audio
C21 2nd Level 2 Coursebook.pdf
C21 2nd Level 2 Slideshows
C21 2nd Level 2 Teacher’s Book.pdf
C21 2nd Level 2 Workbook.pdf

Level 3 (A2)
C21 2nd Level 3 Audio
C21 2nd Level 3 Coursebook.pdf
C21 2nd Level 3 Slideshows
C21 2nd Level 3 Teacher’s Book.pdf
C21 2nd Level 3 Workbook.pdf

Level 4 (B1)
C21 2nd Level 4 Audio
C21 2nd Level 4 Coursebook.pdf 
C21 2nd Level 4 Slideshows
C21 2nd Level 4 Teacher’s Book.pdf
C21 2nd Level 4 Workbook.pdf

Level 5 (B2)
C21 2nd Level 5 Academic Skills
C21 2nd Level 5 Audio
C21 2nd Level 5 Coursebook.pdf
C21 2nd Level 5 Slideshows
C21 2nd Level 5 Teacher’s Book.pdf
C21 2nd Level 5 Workbook.pdf