题目

One day during winter holiday , Jacob went to visit his grandmother . The six-year-old boy form Connecticut(康涅狄格州) couldn’t wait to play baseball when he got to her house . Jacob had brought his bat , but he had forgotten to bring a baseball . Jacob’s problem gave him an idea . After returning home , he cut off the top of his bat with his parents’ help . The bat was hollow inside . Jacob dropped some balls into the hollow bat . Then he put a cap on the bat to close it . With the balls inside the bat , Jacob didn’t have to worry about forgetting them on his next visit t将一枚回形针轻轻放入装满水的杯子里，水没有溢出；再放入几枚，水也没有溢出；继续放入回形针直至杯中水溢出．老师要求同学针对这一现象，提出一个问题．下面是四位同学的发言，其中较有价值且可探究的问题是（　　）A．“装满水的杯中放入回形针水不会溢出，是因为水中有空隙．”B．“装满水的杯中放入回形针水会溢出吗？”C．“为什么装满水的杯中放入回形针水不会溢出？”D．“能放入回形针的多少与杯子的材质、杯子的形状有什么关系？”