單項(xiàng)選擇題

A little （）may cause great damage or loss.

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

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單項(xiàng)選擇題

Never operate hatch covers when the ship is（）.

A. in port
B. anchoring
C. rolling or pitching
D. at sea

單項(xiàng)選擇題

You are responsible for （）hatches today.

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