单项选择题

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

A.Closed
B.Close
C.Closing

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单项选择题
Inform the bridge and give the alarm at once （）the fire.

A. in case
B. case of
C. in case of
D. in the case of
单项选择题
Fire and boat drills are carried out （）.

A.periodically
B.quarterly
C.monthly
D.yearly
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