题目

图为丁俊晖打台球的一个镜头，球杆撞击小球后使球运动，说明力能使物体的             ；甲球撞击乙球后甲球的速度变慢，这是由于甲球的动能_______（选填“转移”或“转化”）到乙球上了；在球与球相互撞击的过程中还会因为摩擦而产生热量，这是通过____________的方式改变了球的内能． 答案：运动状态发生改变    转移   做功听较长对话，选择正确答案。听第一段对话，作答第1-2小题。 1. Why does Helen look unhappy? [     ]A．Because she argued with her mother. B．Because she argued with her father. C．Because she argued with her best friend. 2. What clothes did Helen want to buy? [     ]A．Li Ning's clothes. B．Adidas'clothes. C．Nike's clothes.听第二段对话，作答第3-5小题。3. Does Jenny have any DVDs about space? [     ]A．No, she doesn't. B．Yes, she does. C．No, she won't.4. What did the science teacher ask Jenny to look for? [     ]A．Some information about travel. B．Some information about space. C．Some information about DVDs. 5. What does Tom think of space? [     ]A．It is boring. B．It is terrible. C．It is amazing.