用频数表法计算中位数时，要求
A．组距相等
B．组距不等
C．组距相等或不等都可以
D．组距成倍数增加
E．组距成倍数减少
参考答案：C
Beijing Man used fire for cooking food and also for light, warmth and ________
wild beasts.
A．protected from
B．protection from
C．protecting from
D．to protect from
车站和列车对应剪口而未剪口或应签证而未签证的车票，应进行补剪、补签，核收手续费。（部竞赛题）
