2. On the micro service page, find the book selection option and click Enter.
3. On the book selection page, you can see the teaching materials and supplementary materials of all grades and subjects, and you can choose according to your own needs.
4. After selecting teaching materials or supplementary materials, click the "Add to Shopping Cart" button to add them to the shopping cart.
. 5. After joining the shopping cart, you can choose the payment method, make payment and complete the book selection operation.