题目

Simple ways to keep your mind sharpWe’re all part of a fantastic intellectual and information economy, which relies on ideas, creativity and intelligence. Keeping your mind sharp is sure to give you the edge over the competition. 【1】 Continue reading and gaining knowledge. Education is not preparation for life; it is life itself. Read blogs on subjects both within or beyond your field: read books; watch lectures on fascinating new subjects; and read about ancient societies. 【2】 Learn a skill you’ve never tried before. You’re never too old to do this, but this is definitely someth高一新生参加军训，一学生进行五次实弹射击的成绩（单位：环）如下：8，6，10，7，9，则这五次射击的中位数是88环，方差是22．