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【简答题】
如图是人的呼吸和血液循环关系图，据图回答问题． （1）血液由[______]______经过[______]______后，由______血变成______血，再由[______]______流回到[______]______，完成肺循环． （2）[①]与外界环境之间的气体交换依靠______来实现，[①]与[②]之间的气体交换依靠______实现． （3）血液由[______]______经过[______]______给全身组织细胞供血，在[______]______处进行气体交换，______血变为______血，由[______]______流回[]______完成体循环． （4）[11]、[12]之间的气体交换靠______来实现．绝大部分氧在血液内以______的形式由______运输．
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