1. The seventh edition of the mathematics textbook published by Jiangsu Education Press contains chapters on rational numbers, algebraic expressions, linear equations of one yuan, entering the graphic world, understanding plane graphics, data collection, etc. , but does not include the contents of the moving line segment.

2. The content of the moving line segment belongs to the geometric category, which is generally arranged in the subsequent mathematics textbooks. However, the mathematics textbook in the seventh edition of Jiangsu Education Press mainly studies algebra and rational numbers, so there is no arrangement for the content of moving line segments.