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填空題

消化的方式為（）

答案：物理性消化、化學(xué)性消化、微生物消化

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牛的結(jié)腸位于（），可分為（）

答案：腹腔的右側(cè)；初袢、旋袢、終袢

牛羊的角是由（）衍生而來的。

答案：皮膚

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