【正确答案】
(Student's sample)
Today, most students can no longer survive without a mobile phone. Thanks to mobile phones, we college students know each other and have fun. First of all, mobile phone is necessary. In universities, the boundary of classes are being broken up and most notices are sent to us through SMS, rather than posts or class meetings. What more, mobile phone adds so much fun to students' daily life. It is the mobile phone which gives us young people more emotional experiences. To most of us, owning a mobile phone is a daily life necessity.
(Improved sample)
Today, most students can no longer survive without a mobile phone. Thanks to mobile phones, we college students are well connected as well as entertained. First of all, the mobile phone is a necessity for communication. In universities, the boundary of classes has been broken up and most notices are sent to us through $MS, rather than through posts or class meetings. Moreover, the mobile phone adds so much fun to students' daily life. It is the mobile phone that gives us young people more emotional experiences. To most of us, owning a mobile phone is a daily life necessity.