维生素B2的生理功能有哪些? A. 参与体内生物氧化与能量生成;B:参与维生素B6和烟酸的代谢;C:参与体内的抗氧化防御系统;D:参与同型半胱氨酸代谢;
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【简答题】Listen and complete the missing words. John F. Kennedy and Abraham Lincoln lived in different times and had very (1)____________ family and educational backgrounds. Kennedy lived in the 20th century ;...
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