卜之所以有很高的营养价值，

canbook123

在于其含有大量胡萝卜素，胡萝卜素在体内可以分解生成为维生素A。因此，吃胡萝卜是天然的最好的补充维生素A的方法。维生素A可影响多个系统的黏膜细胞生物合成，如果呼吸系统的气管黏膜缺乏维生素A时，
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