单项选择题

A little （）may cause great damage or loss.

A.care
B.careless
C.carelessness
D.careful

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单项选择题
Never operate hatch covers when the ship is（）.

A. in port
B. anchoring
C. rolling or pitching
D. at sea
单项选择题
You are responsible for （）hatches today.

A.close
B.toclose
C.closing
D.closed
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