z=2i1-i
=2i(1+i)(1-i)(1+i)
=2i+2i22
=-1+i．
故选B．
用适当的介词填空。
1. I go bed at 9:00.
2. Thank you telling me your day.
3. I can play snow.
4. My birthday is August.
红斑性烧伤是（）。
A.Ⅰ度烧伤
B.浅Ⅱ度烧伤
C.深Ⅱ度烧伤
D.Ⅲ度烧伤
E.轻度烧伤
