若圆锥的轴截图为等边三角形,则称此圆锥为正圆锥,则正圆锥的侧面展开图的圆心角是()
A:90°
B:120°
C:150°
D:180°
下列关于下丘脑的叙述,正确的是( )
People didn't go to school by the bus. ____