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图表示人体内某处气体交换的过程： （1）已知A是体内气体交换的主要器官，则A的名称是______，在A中与血液进行气体交换的结构是______． （2）B是______，B结构液体中二氧化碳和氧气之所以能与A结构内的二氧化碳和氧气进行气体交换，依据的原理是______．
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A.
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B.
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