One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.
A、conveniently
B、obediently
C、sufficiently
D、reluctantly
【正确答案】：B
【题目解析】：译文：海岸警卫的职责之一就是确保所有的船只在驶入繁忙的港口时有秩序地遵守交通规则。这里缺少的是一个副词。conveniently指"方便地”；obediently指“顺从地"；sufficiently指“足够地”；reluctantly指“不情愿地”。答案为B。
