复数(1＋2i)2的共轭复数是________．
－3－4i
(1＋2i)2＝1＋4i－4＝－3＋4i，其共轭复数为－3－4i.
. The river, ____ are covered with trees, is very long.
A．which banks
B．of which banks
C．whose the banks
D．the banks of which
自闭症治疗方式有哪些？
