题目

Complete the following passage with the words in the box. Each can only be used once（将下列单词填入空格。每空格限填一词，每词只能填一次） A. keen B. lied C. locate D. trained E. layDogs are known to help humans to protect farm animals, find illegal drugs, and rescue people during natural disasters. But did you know that dogs can also be【1】to help protect plants and animals?Due to their 【2】sense of small and their high energy level, dogs can be taught to look for alien species（物种）that endanger local plants and animals. For example, in the United State看拼音写汉字： 人n@己n@（　　）