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單項(xiàng)選擇題

The system of derricks and winches has been largely replaced on newer ships by cranes（）it is very efficient.

A.when
B.because
C.unless
D.though

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The term loading and unloading cargo means（）.

A.arranging cargo
B.shipping cargo
C.cargo handling
D.weighing cargo

單項(xiàng)選擇題

The tide is（）.

A.black
B.setting
C.being
D.having

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