.1. 我写此信的目的是向你解释我上次缺课的原因。Im writing to explain to you the reason why I was absent from your lecture last time.2. 首先，我们要对网络持有有正确的态度。First of all /Firstly/ To begin with/First/In the first place/Initially, we should take a proper attitude to/towards the Internet.3. 如图所示，每周上网15个小时的中学生占了 60%。As is shown in the graph/ As the graph shows, those who surf the net over 15 hours account for /make up/ 60 percent of all students.4.另外，我口语流利，可以和外国朋友自由交流。Besides/ In addition, I can speak fluen
