<{p}><{font _mstmutation="1" _msttexthash="122144919" _msthash="5178"}>.缺乏时，引起巨幼红细胞贫血的维生素是<{/font}><{br/}><{/p}>

【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="11073595" _msthash="5180"}>.维生素B2<{/font}><{br/}><{/p}>
B <{p data-we-empty-p="" _msthidden="1"}><{font _mstmutation="1" _msttexthash="9839063" _msthidden="1" _msthash="5181"}>维生素B1<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="11080277" _msthash="5190"}>.维生素PP<{/font}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msttexthash="6596642" _msthash="5191"}>.叶酸<{/font}><{br/}><{/p}>
E <{p}><{font _mstmutation="1" _msttexthash="9833226" _msthash="5192"}>维生素K<{/font}><{br/}><{/p}>

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