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婴儿期易疲劳而进入睡眠状态是因为（）。

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婴儿期易疲劳而进入睡眠状态是因为（）。

A.大脑的皮质较薄

B.树突与轴突少而短

C.脑重量较轻

D.神经髓鞘形成不完善

E.脑组织耗氧量大

参考答案:

答案：神经髓鞘形成不完善

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