职业道德规范是()
A.参加社会实践
B.爱岗敬业
C.移风易俗
D.改革殡葬
参考答案：B
小刚同学要在墙上钉牢一根木条至少需要 _________ 根铁钉，其数学道理是 _________ ．
—Which is the biggest number of the four?
—________. [ ]
A. One-third
B. Two-thirds
C. A half
D. A quarter
