单项选择题
At each drill a different person should be in （）(负责)of an extinguisher.
A.charge B.load C.discharge D.handle
单项选择题 （）(除了) the fire drill, there are also boat drill and emergency drill on board.
单项选择题 （）(放低) the embarkation ladder.
单项选择题 Collect oil with （）(油桶).
