题目

 The trainer praised me, for what I did was better than_____ of the top player on the team.    A. any    B. each   C. that   D. those 答案：C将一个重为15N的物体挂在弹簧秤下，并使物体浸没在水中，弹簧秤的示数为5N，则该物体的密度是多少？