题目

She is a ______ singer. She sings ________. A . good, good B . good, well C . well, good D . well, well 答案：B直三棱柱ABC-A1B1 C1的六个顶点都在球O的球面上．若AB=BC=1，∠ABC=120°，AA1=23，则球O的表面积为（　　）A．4πB．16πC．24πD．8π