天主教的主要节日有圣诞节、复活节、神圣降临节、圣母升天节。
参考答案：对
—We can use QQ to talk with each other online.
—Really? Could you please show me ______ it? [ ]
A. how to do
B. what to do
C. when to do
D. why to do
蒸汽温度高报警值应比该压力下的饱和温度高出约（）。
A、200F
B、20℃
C、300F
D、30℃
