阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个恰当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

Detecting drugs used to be a special job for dogs, 【小题1】 now a drug detection team is welcoming some newcomers — squirrels (松鼠). Squirrels have a sharp sense of smell as they can smell food 【小题2】 about 30 centimeters of snow. Being so small and swift, they are able to search for drugs in areas 【小题3】 dogs may not be able to arrive. Squirrels have been trained to make noises to catch their handlers’ attention if they detect drugs.