Customs officers at a London airport yesterday found 50，000 poun

Customs officers at a London airport yesterday found 50，000 pounds worth of drugs which were being smuggled (走私) into Britain in boxes marked “Urgent Medical Supplies”.The authorities might have suspected for some time ___26___ drugs would be brought into the country in this way. The operation is believed to be the work of a ___27___ international group. Four men were arrested at ___28___ airport and held for questioning, ___29___it is unlikely that they are the organizers. In ___30___ they declared that they were ___31___ of what the boxes contained and had acted in good faith in bringing ___32___ into Britain. This is the third time ___33___ six months that attempts have been made to smuggle ___34___ goods through Customs by declaring them to __35____ medical supplies. They are frequently ___36___ in special containers and a note is given that they may be damaged if they are not handled with care.“ ___37___ are determined to put a ___38___to this practice，” said one of the Customs officers today. “ __39____ is no way these people are going to get away ___40___ this any longer. We have the full co-operation of the international police to track down the main source of supply.”
回答第31空
A、unconscious
B、unaware
C、unfamiliar
D、unknown
【正确答案】：B
【题目解析】：本题考查形容词辨析。be unconscious of 和 be unaware of 均意为“不知道”，但 conscious 指内心的感觉，强调深刻的心理活动，aware 强调通过耳闻目睹或感觉而得到信息，也指敏锐的观察和推断。unfamiliar 后一般跟介词 with 或 to，unknown 后一般跟介词 for或 to。故选 B。