My brother lives in ______ on ______ floor.

A．six Room ;second

B．Room six ;the second

C．Room six; two floor

D．the room six ; the second

道路运输驾驶员肩负着安全运输和保障道路畅通的重任，良好的职业道德必然会带来行车安全和较高的经济效益。