问题详情

The Roll-call system has been commonly adopted by college teachers to check students attendance. Recently, more high-tech approaches, such as QR code (二维码) , finger printing, and smart phone applications, are introduced into this system. What is your opinion？ Write a composition of about 200 words on the following topic: My Views on the Roll-Call System at University

请帮忙给出正确答案和分析，谢谢！