A:So fine was the weather
B:So was the fine weather
C:The weather was so fine wa
D:So the weather was tine
“乙未以后,北洋新军肇建,维新运动大起,革命运动亦萌芽于海外,而戊戌、庚子之变继起于中枢”。材料中的“乙未”应指( )
4的平方根是( )