请选择CBA1|8D4m+T-r+v-e;O)E3f2M7c,k Can robots walk downstairs?4C4w5K3D6z.].y
A. Yes, they do.4C4w5K3D6z.].y
B. Yes, they can.4C4w5K3D6z.].y
C. Yes, it can.4C4w5K3D6z.].y