A:I called you yesterday. You didn't answer it. B:Oh, sorry. I_ in the bathroom at that time.
A:was taking a shower
B:took a shower
C:take a shower
如图,PA、PB分别切⊙O于A、B,PA=10cm,C是劣弧AB上的点(不与点A、B重合),过点C的切线分别交PA、PB于点E、F.则△PEF的周长为( )
下列关于七大洲的叙述,正确的是:
书店第一季度的营业额为15万,第二季度的营业额为20万。下列说法错误的是( )。