为防止车辆和人员通过风门时造成风流短路，应在同一巷道内设臵两道风门。
参考答案：对
颊尖偏远中的牙是（）。
A.上颌乳尖牙
B.下颌乳尖牙
C.上颌第一前磨牙
D.上颌第一乳磨牙
E.下颌第一乳磨牙
I _____ along the road when I saw Peter. So we stopped and had a chat.[ ]
A. walked
B. was walking
C. would walk
D. had walked
