运动神经元病病理改变的显著特征是（）。
A.神经元水肿
B.神经元变细
C.神经元选择性坏死
D.神经元固缩
E.神经元数目减少
参考答案：C
11. She dedicates herself to her work. She is such a dedicated teacher that her efforts will _____.
A．pay off
B．be fed on
C．pay back
D．be given back
即使火风压达到一定值时，其旁侧并联风流也不会发生逆转。
