来源：学生作业帮 编辑：作业帮 分类：综合作业 时间：2024/07/08 22:01:15
英语（按首字母补全单词）
Some study animal diseases and try to find way to keep the animals from getting i_____.They do studies in m____ for animal.Vets listen to animal's h_____.They o___ on animals when they need to.
ill
medicine
heartbeat
operate
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