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單項(xiàng)選擇題

Throw a （）to the person overboard and help him come on board.

A.lifeboat
B.life-raft
C.lifebuoy
D.fire mask

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單項(xiàng)選擇題

（）extinguish oil and electrical fires with water.

A.Do
B.Did
C.Never
D.Isn’t

單項(xiàng)選擇題

（） fire doors, windows, hatches, accesses and ventilators.

A.Closed
B.Close
C.Closing

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