【单选题】【消耗次数：1】
胶原蛋白形成过程中的必需成分是（）
①
A维生素A
②
B维生素C
③
C叶酸
④
D矿物质
参考答案：
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【单选题】
下列食物中属于优质蛋白的是( )。
①
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2
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false
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大米
②
Normal
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7.8 磅
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mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
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豆腐
③
Normal
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X-NONE
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山药
④
Normal
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7.8 磅
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2
false
false
false
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