單項選擇題

The sailors should show the relevant （）by day.

A.ladders
B.flags
C.hands
D.lines

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單項選擇題

You should （）the mooring lines according to the changes of draft.

A.adjusted
B.adjusting
C.adjustment
D.adjust

單項選擇題

Pay more attention to the rising and falling of （）.

A.tide
B.water
C.sea
D.wave