题目

—       did you go       vacation? — I went to Shanghai.A. What, for      B.  When, on             C.  Where, on 答案：C种子蕨化石证明下列具有亲缘关系的植物是 [    ] A．藻类和苔藓类 　　    B．苔藓类和蕨类 C．蕨类和裸子植物 　　  D．蕨类和被子植物