题目

圆x2＋(y＋1)2＝3绕直线kx－y－1＝0旋转一周所得的几何体的表面积为( ) A．36π  B．12π  C．4π  D．4π 答案：BI was really anxious about you.You ________ home without a word.A．mustn't leaveB．shouldn't have leftC．couldn't have leftD．needn't leave