| 1 | They are developing a new textbook. | |
| 2 | This textbook is extremely comprehensive and very practical. | |
| 3 | The reading course book, plus its reference books, is helpful to college students. | |
| 4 | This textbook is suitable for learners at HSK level 5 and above. | |
| 5 | They changed the textbooks, but the teacher's teaching style remained the same. |
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