下面各数被2除余数都为0的一组是( )
A:98,45,301
B:39,48,52
C:42,980,66
用边长相等的正三角形与正方形能够密铺,设在一个顶点周围有x个正三角形的角,有y个正方形的角,则x=____,y=____ .
He's under stress because he has too much work to do.