四年级课本 -A / Fourth Grade Book -A

免责声明 / Disclaimer

每个年级的老师可能会根据教学需要，适当调整教学内容。内容仅供学习参考，为获得完整学习体验（音视频、练习册），建议购买正版图书。

Teachers at each grade level may adjust teaching content as needed for instructional purposes. For study reference only. Please purchase the official textbooks for the full experience (audio, video, and workbooks).