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單項選擇題

Ships often become （）(臟). So cleaning is a frequent job on board.

A.clean
B.claw
C.dirty
D.deck

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單項選擇題

It is necessary for her to （）(執(zhí)行) the general day-to-day repair on board.

A. work out
B. look out
C. wipe out
D. carry out

單項選擇題

Before entering or leaving a harbour, the ship should be given a （）(徹底) cleaning.

A.throw
B.through
C.thorough
D.though

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