题目

地球的形状是（ ）A.椭圆 B.圆 C.圆球体 D.不规则的球体 答案：【答案】D【解析】地球的形状是两极略扁赤道略鼓的不规则的球体；故选：D。31、-- Can I call for some friends and spend the day outside with them, Mom? --- ____ I’ve told you to have a weekend on your own.    A. Why so?                   B. Why not?          C. How come?               D. So what?