A:黄金首饰
B:粮食、肉类
C:出境旅行
D:轿车、别墅
- Finish your homework ________ you can't play games.
- All right, Mum.
A=x|x=2k,k∈Z,B=x|x=2k+1,k∈Z,C=x|x=4k+1,k∈Z,又a∈A,b∈B则( )
It has stopped _____________.