Customs officers at a London airport yesterday found $500000 worth of drugs which were being smuggled into Britain in boxes marked "Urgent Medical Supplies. " The (51) might have suspected for some time that the drugs were being brought into the country in this way. The (52) is believed to be the work of a well-organized international group. Four men were arrested at the airport and held for questioning, (53) it is unlikely that they are organizers. In fact, they declared that they were (54) of what the boxes contained and had acted in good faith in bringing (55) into Britain. This is the third time in six months that attempts have been made to smuggle (56) goods through Customs by declaring them to be medical supplies. They are frequently (57) in special containers and a warning is given that they may be (58) if they are not handled with care. They are determined to put a (59) to this practice, said one of the Customs officers today. (60) is no way these people are going to get away with this any longer. We have the full cooperation of the International Police who are as anxious as we are to track down the main source of supply.
51（）。
A.authorities
B.commanders
C.leaders
D.directors
参考答案：A
解析：
此题测试近义词辨析能力。A项authorities意为“官方，当局”；B项commanders意为“指挥官”；C项leaders意为“领导人”；D项directors意为“领导者”。在这几个词中．只有A最切合上下文意思，其他选项填入句子中指代不清楚，均不正确。