考点线线角 求线线角线面角 求线面角二面角 求二面角，已知二面角求体积高考达标检测（三十二）团Tiffany ，a 16yearold girl ，was very shy.Last September ，her best frien “I was really sad the moment I heard the bad news and I didnt know what to do ，” Tiffany recalled.“I shut myself in my room for a whole week.It was then that my aunt took me to a sports club one Saturday and I saw so many young people playing different kinds of sports there.I signed up for a beginners course in volleyball and since then I have been playing this sport.Now I practi
