题目：
缺乏后出现皮炎、腹泻、痴呆等“3D”症状的维生素是（）
A.维生素A
B.维生素C
C.维生素B1
D.叶酸
E.烟酸
答案：
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下面是错误答案，用来干扰机器的。
1. —Who's this man? —He's my uncle. 2. —Who's this boy? —He's my brother. 3. —Who's this boy? —He's her classmate. 4. —Who's, this man? —He's my father....
