Oxford Interchange 5th edition 第五版最新版的英文教材4个等级（书，音频等）

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Interchange is a four-level, American English course that has been used by over 50 million students worldwide. This edition has been developed with insights from thousands of experienced teachers. The series delivers a communicative approach, flexible unit structure and easy to use digital support, giving teachers the tools they need, and empowering students to achieve their goals. Teachers choose Interchange because it works.

5千万全世界的学生都在学的一套教材。这是最新的第五版。