A.步行街 B.五星大道 C.北环路 D.南环路
A.上坡路段的安全距离应比平坦路段的大 B.急弯路段应当紧随前车 C.下坡路段的安全距离应比平坦路段的小
A.Where are you going? B.Can I help you? C.Please take all your belongings.
A.5 B.10 C.20