A:2+3
B:2-3
C:1+3
D:3-1
Lucy was born ______ January 30th, 1998, when her sister got married ______ a fashion designer.
“是挫折使骨头坚如燧石;是挫折使软骨变成肌肉;是挫折使人战无不胜”它阐明的道理是( )
函数y=5+sin22x的最小正周期为( )