大剂量具有降低血胆固醇水平的是（）
A.硫胺素
B.核黄素
C.吡哆醇
D.烟酸
E.叶酸
参考答案：D
He will have to watch his ________ because of his serious stomach problem. [ ]
A. style
B. diet
C. smell
D. menu
