单选题
One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.
A、
cautiously
B、
dutifully
C、
faithfully
D、
skillfully
【正确答案】
B
【答案解析】
[解析] B项的意思是：dutifully守本分地。A. cautiously小心谨慎地；C. faithfully忠诚地；D. skillfully熟练地。
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