單項選擇題

（） just looks like a guard standing on the deck.

A.Mast
B.Master
C.Must
D.Main deck

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單項選擇題

（）are used to clean the bridge.

A.Rags
B.Rats
C.Rubbish
D.Derricks

單項選擇題

Saw dust is used to （）.

A. absorb the oil
B. repair the derrick
C. adjust the boom
D. fill the ballast water