Finding the old man in danger ,        .  [      ]

A. a doctor was sent for without delay.

B. an ambulance was called for at once.

C. his son sent for a doctor at once.

D. The house was crowded with his children.

伤口处的病毒可以通过下列哪一个途径引发狂犬病

A．进入血液循环

B．进入局部淋巴结

C．侵入局部血管内皮细胞

D．侵入局部白细胞

E．侵入邻近的末梢神经