电脱盐罐水冲冼应定期进行，最好要（）进行一次。
A、每班
B、每天
C、每周
D、每年
参考答案：C
国家审计署驻省的特派办，其正副特派员，由国家审计署决定任命。( )
All the government leaders and policemen in Thailand must see to ______ that every citizen should stay safe and sound in the terrible flood. [ ]
A. all
B. everything
C. it
D. themselves
