Does the subject want to ask, "Why can't I scan it after 53 days of practice and analysis?" The QR code has expired. According to China Education Online official website, the QR code of "53 Days of Practice" has a time limit, and it will not be scanned after it expires. Need to contact the customer service phone at the back of the book and resend the QR code of the question bank. 53 Days of Practice is a book published by Capital Normal University Press and Education Science Press on 20 19. The author is Qu Yixian.