Sometimes walking is even _______ than driving during the busy traffic time.
A:fast
B:faster
C:fastest
小明用一个半径为5cm,面积为15πcm2的扇形纸片,制作成一个圆锥的侧面(接缝处不重叠),那么这个圆锥的底面半径为 ( )
某思想家强调孝、悌、慈等伦理道德均源于人之自然本性,这位思想家是( )