They put the _______on. They went to the playground Together.
A:caps
B:cats
C:cups
已知圆C1的方程为f(x,y)=0,且P(x0,y0)在圆C1外,圆C2的方程为f(x,y)=f(x0,y0),则C1与圆C2一定( )
下列不属于单细胞生物的是( )