单项选择题
Efficient fire-fighting drill demands the full （）of persons in all departments of the ship.
A.operate
B.operation
C.co-operate
D.co-operation
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相关考题
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单项选择题
The signals that will be used for emergency should be clearly （）.
A. set out
B. set off
C. get off
D. cut off -
单项选择题
The fire drill is （）. You are dismissed.
A.finish
B.finished
C.begin
D.beginning -
单项选择题
Lower the （）ladder.
A.embark
B.embarkation
C.disembark
D.B+C
