童年期所指的年龄阶段是
A．三岁至五六岁
B．五六岁至十一二岁
C．六七岁至十一二岁
D．六七岁至十三四岁
参考答案：B
Janny ____ have kept her word. I wonder why she changed her mind. [ ]
A. must
B. should
C. need
D. would
敏感性分析的绝对值方法，是计算( )。
A．因素变动值
B．指标变动值
C．敏感性系数
D．临界点
