题目

运动员用200N的力把质量为0.5kg的球抛出，球在水平路面上滚动30m，则该学生对球做的功是：（    ） A．6000J    B．150J   C．3000J    D．无法确定 答案：D 解析:根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意义连贯、完整。 A: Hello! 65772896. B: Hello! This is Lucy. 1.                         ? A: Yes. This is Alice speaking.  B: 2.                        ? A: I'll have nothing to do this evening. I've finished all my homework. B: 3.                        ? I've got two tickets for the movie "Superman". A: Sure, I'd love to. I want to see "Superman" very much. I've heard it's so exciting. 4.                       ! Then    I would do everything I have always wanted to. B: That's impossible. By the way, 5.                           ? A: Let's meet at the No. 3 bus stop at 6 pm. B: OK! See you then.