Test and analysis: Flowchart is a chart composed of graphic symbols and text descriptions. Flowchart can be used to represent some dynamic processes, which can directly and clearly represent all the steps of the dynamic process from the beginning to the end. Before drawing a flow chart, we need to find out the steps to solve practical problems and the development process of things. The following steps can be followed: ① divide the process of solving practical problems into several steps; (2) Make clear the sequence relationship between the parts; (3) express each step in concise language; (4) Draw a flow chart and check whether it meets the actual problem. This topic is a process of borrowing books. The process of borrowing books is divided into the above six steps, and the correct order is option B.