By the year 2015, all of China's museums will be free to enter. We _____ visit any museum without paying. [ ]

A. can

B. need

C. must

D. should

( )的结果应形成文件，并作为建立职业安全健康管理体系的基础。

A．初始评审

B．体系试运行

C．体系策划

D．学习和培训