地方性甲状腺肿是一种常见于偏远山区的营养缺乏症，对患者及其后代有严重的危害。有效的防挣措施是在食用盐中添加[ ]
A．钙
B．磷
C．铁
D．碘
答案：D
口腔癌的致病因素常见的是（）
A.咀嚼槟榔
B.吸烟
C.饮酒
D.营养
E.以上均是
Too much drinking and smoking ______ his death.
A．resulted from
B．brought with
C．conquered
D．contributed to
