单项选择题

We are going to carry out an emergency （）.

A.practise
B.practice
C.drill
D.drills

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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

单项选择题

（）extinguish oil and electrical fires with water.

A.Do
B.Did
C.Never
D.Isn’t

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