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【单选题】
脏与脏之间的关系表现为气血关系的是( )A.
心肺
B.
肺肝
C.
肝肾
D.
肺肾
E.
肝脾
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A.
He is very forgetful.
B.
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C.
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D.
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【单选题】下列有关细胞分化的描述，正确的是（）
A.
是一种临时性的变化，在胚胎时期达到最大限度
B.
人的胰岛细胞产生胰岛素，不产生血红蛋白，是因为胰岛细胞中无血红蛋白基因
C.
细胞分化过程中遗传物质发生了改变
D.
是一种持久性的变化，其稳定性变异是不可逆转的
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