如图所示，轨道ABC光滑，弹簧固定在水平轨道的C处．小球从A点由静止开始下滑的过程中，　____ 　能转化为　____ 　能；在撞击到弹簧使弹簧被压缩的过程中，　____ 能转化成　____ 　能．（选填“动能”、“重力势能”或“弹性势能”）

如图所示是一种常用的动圈式话筒（麦克风）及其原理图．当你对着话筒说话时，声带____ 发出声音，声波使与金属膜片相连的音圈振动．音圈即线圈，它在磁场中能产生随声音变化而变化的电流，这是____ 现象．这个过程将声音信号转变成____ 信号．

仔细阅读下面的信息,然后填写表中的内容
Dear Wang Hong,
I am an American school girl. My name is Alice Green. I am twelve. There are five people in my family-my brothers, my parents and I. My brothers and I are all students at the same school. We go to school from Monday to Friday. We don't have any classes on Sundays or Saturdays. My father and mother are teachers. They say, China is great, and  Chinese people are friendly, I want to travel in China. I think it is very interesting, isn't it? I like reading. Now I am reading a book of Chinese stories. They are very interesting. My brothers and I like playing soccer and basketball. What do you like?
Let's be friends. Please write soon.
Yours,
Alice Green
Information Card

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