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單項選擇題

（）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.

A.Smoking
B.Drug and alcohol abuse
C.Fruit
D.Vegetables

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單項選擇題

Malacca Strait is 805 km（）and（）from 64 km in the S to 257 km in the N.

A.long, widens
B.long, wide
C.length, widens
D.length, wide

單項選擇題

It is customary in shipping practice to quote freight rates（）weight or measurement,ship’s option.

A.on the basis of
B.as a result of
C.arise from
D.come into being