国家对女职工和未成年工实行（）。
A.特殊社会保障
B.特殊劳动保护
C.特殊劳动保险
参考答案：B
请述治疗“干霍乱”的三种简便有效的方法。
_____ they visited the Science Museum，they showed great interest in everything they saw. [ ]
A. The first time
B. For the first time
C. At first
D. At the first time
