问题
单项选择题
（）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.
A.Smoking
B.Drug and alcohol abuse
C.Fruit
D.Vegetables
答案
参考答案：B
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（）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.
A.Smoking
B.Drug and alcohol abuse
C.Fruit
D.Vegetables
参考答案：B