One * * * is four volumes. I have just finished learning these four volumes. The difficulty is progressive, and exercises after class are more suitable for the form of CET-4 and CET-6. Each unit will also have grammar and etymological explanations. Relatively speaking, it is quite suitable for college English learning.

Each volume is divided into reading and writing classes, audio-visual speaking classes, fast reading and comprehensive reading.

Because I have studied it, you are welcome to ask questions in the future, and you can ask questions and answer them. Thank you for adopting ~