A:人有悲欢离合,月有阴晴圆缺,此事古难全
B:飞流直下三千尺,疑是银河落九天
C:思所以危则安矣,思所以乱则治矣
D:操千曲而后晓声,观千剑而后识器
The weather in Kunming is ______ too cold _____ too hot. People like to live there.
1=1=12
1+3=4=22
1+3+5=9=32
1+3+5+7=16=42
…
按规律填空: