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
选［B］所给四个副词的意思分别是：［A］谨慎地；［B］尽职地顺从地；［C］忠实地；［D］灵活地巧妙地对于轮船来说遵守交通规则是它们的职责所以只能选［B］本句大意：海岸护卫的责任之一就是要确保在繁忙的港湾所有的船只都要尽职地遵守交通规则
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