多巴反应性肌张力障碍的致病基因为（）
A.ATP7B
B.DYT-1
C.UCH-L1
D.GCH-1
E.IT15
参考答案：D
屋面坡度大于（）时，应采取防滑措施。
I tried phoning her office, but I couldn't________[ ]
A．get along
B．get on
C．get to
D．get through
