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.
54（）。
A.unconscious
B.unaware
C.unfamiliar
D.unknown
参考答案：B
解析：
此题属近义辨析题。A项unconscious意为“失去知觉的，无意识的”．常用于be unconscious of sth. /that结构；B项unaware意为“不知道的；没有觉察到的”，常用于be unaware of sth. /that结构；C项unfamiliar意为“不熟练的”，常用于be unfamiliar with sth. 或者be unfamiliar to sb. 结构；D项unknown意为“未知的”，常用于be unknown to sb. 结构。这句话是说，他们四人声称对箱内装的物品不了解，未发觉是毒品，因此应选B项unaware。
