被狗咬伤后注射狂犬疫苗属于

A．人工主动免疫

B．自然主动免疫

C．人工被动免疫

D．自然被动免疫

E．非特异性免疫

When you see Tom and his sister, tell _____ that _____ mother is waiting at the gate.[ ]

A. his; his

B. her; hers

C. them; their

D. his; her