单项选择题
A.down B.top C.lower D.up
Ready for （）the boat.A.lowerB.loweringC.loweredD.topped
单项选择题Ready for （）the boat.
A.lower B.lowering C.lowered D.topped
We are going to carry out an emergency （）.A.practiseB.p...
单项选择题We are going to carry out an emergency （）.
A.practise B.practice C.drill D.drills
Throw a （）to the person overboard and help him come on ...
单项选择题Throw a （）to the person overboard and help him come on board.
A.lifeboat B.life-raft C.lifebuoy D.fire mask
