题目

—What are you doing, Jack? — I’m looking for some information about famous people ____ can help make a poster. A. who    B. what         C. whom D. that 答案：D17．教室里一个开关同时控制了六盏日光灯，则六盏日光灯（　　）A．一定是串联电路B．一定是并联电路C．可能是串联电路，也可能是并联电路D．既不是串联也不是并联