题目内容

家禽心血管系统的解剖结构特征()

A. 家禽肝门静脉分为左右两干,左干主要收集胃和脾的血液。右干主要收集肠的血液。
B. 红细胞有核
C. 有右侧主动脉弓
D. 以上都是

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That sentence _______ is wrong.

A. himself
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A. she
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A. himself
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_______ in the world is difficult if you put your heart into it.

A. Everything
B. Nothing
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