【单选题】【消耗次数：1】
获得维生素D最经济的方法是（）
①
喝牛奶
②
口服鱼肝油
③
晒太阳
④
吃动物肝脏
参考答案：
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维生素D的活性形式是
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维生素D<sub>3</sub>；
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24，25-（OH）<sub>2</sub> -维生素D<sub>3</sub>；
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