— This is an exciting holiday. People usually make pumpkin lanterns and go to parties. Children wear (穿戴)

      masks and dress up in costumes, What holiday is it?

— It's _____________. [ ]

A. Halloween

B. Easter

C. Christmas

压力容器出厂资料齐全；设计、制造质量符合有关法规和标准要求的；在设计条件下能安全使用。达到这样的标准的压力容器其安全状况等级为（）。

A、一级

B、二级

C、三级

D、四级