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.

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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