She is going to spend part of her week in Liverpool where she ______ on the beach with her children.

A．is playing

B．plays

C．will be playing

D．has played

饱和蒸汽遇冷即转化为（）而放出汽化潜热，工业锅炉常用饱和蒸汽而不用过热蒸汽。

A、再热蒸汽

B、饱和水

C、过热蒸汽

D、饱和蒸汽