有关甲亢的病因目前公认的是（）
A.与心理因素有关
B.与环境有关
C.与肌体受伤有关
D.与自身免疫有关
E.与社会因素有关
参考答案：D
_____ of my brothers are reporters. Covering events, meetings, or sports meetings ______ their duty.
A．Each, are
B．Both, is
C．Neither, are
D．None, is
作战功能——一体化
