問題詳情

Search dogs are trained to find missing people. Using only its sense or smell, a single dog can search an areaeight times faster than a search team of twenty people.  A search begins when the dog receives the scent from an article that the missing person has handled. Thedog then 54 to work following the scent. Besides good scent, search dogs must be able to learn quickly andbe tough enough to 55 severe weather. However, dogs cannot be used in every search. First, there aren’t enough search dogs to 56 . Theymay have to be flown to a place for hundreds of miles away. Besides, in a very small area, search dogs are notusually needed. 57 they are flown in, a search team could easily have found the missing person. Weatherconditions may not be right for a search dog, either. A scent is especially strong in damp weather. A slight windalso helps. But strong winds or heavy rains can cause a scent to 58 . For these reasons, dogs are used inonly one out of every four searches. But when they are used, they prove their value. Search dogs have done somethings that seemed impossible.
54
(A) situates
(B) lays
(C) takes
(D) sets

參考答案

答案：D
難度：非常困難0
統計：A(0),B(1),C(3),D(0),E(0)

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