引起低钙血症的病因有（）
A.甲状旁腺功能减退
B.维生素D代谢障碍
C.使用噻嗪类利尿剂
D.肾衰竭
E.横纹肌溶解症
参考答案：A, B, D, E
Do tell me the ways you think of _____ the problem as soon as possible. [ ]
A. to solve
B. solving
C. solve
D. being solved
公路分项工程质量等级评定，评分小于（）分者为不合格。
A．60
B．70
C．75
D．85
