有一焦距为10cm的凸透镜，将物体从离凸透镜30cm处沿主光轴移到距透镜20cm处，这个过程中所成的像（）

通读全文，根据对短文的理解，选择正确的答案填空。    

    My name is Tony. I'm1  English boy. I'm twelve years old. I'm a  2 . Jim is my good friend. He3 from the USA. We are in 4  class. He's twelve years old,  5 . I have a nice  6 . Now, look  7  my photo. Jim has a long face, small eyes, brown and short hair. And the boy in a yellow cap is me. Yellow is my favourite 8 . Jim has a  9 . Her name is Kate. She is ten years old. Kate has a round face and  10 eyes. They look different.

当你唱卡拉OK时，要用到话筒（麦克风），如图所示，是动圈式话筒构造示意图，当你对着话筒说话或唱歌时，产生的声音使膜片振动，与膜片相连的线圈也跟着一起振动，根据____ 现象，线圈在磁场中的这种运动，能产生随着声音的变化而变化的____ ，经放大后，通过扬声器还原成声音．