A:一项
B:两项
C:三项
D:四项
There are lots of that students have to follow in school.
I left my book at home. May I borrow ____(你的)?
— No, there .
如图,直径AB为6的半圆,绕A点逆时针旋转60°,此时点B到了点B’,则图中阴影部分的面积是( )