下列运算正确的是( )
A:3a﹣a=2
B:(a2)3=a5
C:a2•a3=a5
D:a6÷a3=a2
The cows____ ____ ____.
如图,在△ABC中,已知DE∥BC,AEEC=23,则△ADE与△ABC的面积比为 ____.
The boy is ____ in the water. ( )