问题

The Roll-call system has been commonly adopted by college teachers to check students atten

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

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