动态水景的类型分为（）
A、流水
B、射水
C、喷水
D、落水
参考答案：A, C, D
已知|Z|=1，则|Z2-2Z+1|7最小值为______．
I’ve won a holiday for two days to Florida. I ______ my mum.
A．am taking
B．have taken
C．take
D．will have taken
