材料： Condor a catamaran vessel operating between the Channel Islands and France．The vessel has two main engines in each hull．All propulsion units are duplicated，with each set independent from the other． Shortly after leaving St Helier，Jersey，with 31 passengers and 18 crew，the fire alarm sounded indicating a fire in the starboard engine room．This was confirmed by the closed circuit television surveillance system which showed flames in the vicinity of the starboard outer main engine．The vessel was immediately stopped，all machinery in the starboard engine room was stopped and the fuel supplies shut down．Jersey Radio was informed of the situation two minutes after the alarm sounded. After closing all ventilation openings and accounting for all personnel，halon fire smothering gas was released into the starboard engine room．This was done five minutes after the fire alarm first sounded. The crew maintained boundary cooling and intermittently operated the sprinkler system to the affected space． Twenty minutes after the alarm sounded the situation was considered to be under control．Using the port main engines the vessel returned to St Helier where assistance was available from shore based emergency services． 问题： Condor has two ________ main engines． A.combined B.independent C.couple D.double The fire accident happened in ________．A.both the engine rooms B.neither engine rooms C.the port engine room D.the starboard engine room The fire was mainly extinguished with ________．A.water B.chemical agent C.foam D.powder It can be concluded that ________．A.no officials from any authority know the accident after it happened B.some officials ashore must have learnt the accident at very beginning C.there must be casualties even they were not mentioned in the report D.fire is not dangerous on board vessel