英语 八年级 填空题 较难

动物主题词汇与表达 — 英语填空题

教科版·英语 Unit 5 Animals Helping People AI 三重审校通过

题目
After an earthquake, a trained dog searches under fallen buildings for people who are still alive. It does not guide a person who cannot see or help the police find a thief. It is a ___.