This summer vocation I am going to do a lot of _________ to prepare for the senior high school.
A:job
B:work
C:invention
D:service
I ____ (wake) up at six this morning.
不等式组3x-1>24-2x≥0的解集在数轴上表示为
在平面直角坐标系中,点A和点B关于原点对称,已知点A的坐标为(-2,3),那么点B的坐标为( )