为了防止中考考试作弊，监考人员利用手持式金属探测器对考生进行检查（如图所示），当靠近金属物体时，在金属导体中就会产生涡电流，探测器发出警报．以下选项中也是利用该原理工作的是（　　）

每当校园响起国歌时，我们都会肃然起敬．能接受音乐刺激产生神经冲动的是（　　）

   Danny is a schoolboy. He 1 in a small town. His home is about ten miles  2 school and the roads are not flat(平坦的). So it's 3 for him to get to school. He 4 at about five thirty every day and has breakfast. Then he5 school at around six o'clock. First, he6 his bicycle to the bus station. That takes about forty minutes.7 the bus takes him to school. It usually takes about thirty minutes. Sometimes he has8time for breakfast at home, so he has something for breakfast on the bus.
   “I've never taken trains. It must be a lot9fun than taking buses,” says Danny. He studies very10at school. He hopes he can go to school in a big city some day. He can take a train to school then.