已知圆O的半径为a，A，B是其圆周上的两个三等分点，则·＝
( )
A．a2
B．－a2
C．a2
D．－a2
答案：B
Does your sister ______ to a movie? [ ]
A. wants to go
B. want go
C. want to go
D. wants go
