S1:Chief,look at the fire water supply system.There are some signs of leaking in the fire hydrant.I'm afraid some damage exists. S2:Sorry,we will rectify it at once. Q:What is the problem? A. The fire water supply system has endangered the ship. B. There are some signs of leaking in the fire hydrant. C. The fire hydrant is leaking sea water. D. There are some signs of leaking on the bridge.