单项选择题Which of the followings is not a representative of virtue ethics
单项选择题在运动实践中(如拳击、球类等),常因情绪紧张会出现( ) A. 瞳孔扩大 B. 瞳孔缩小 C. 瞳孔无变化 D. 两侧瞳孔不对称