While I was waiting to enter university, I saw an advertisement in a newspaper –a teaching job wanted at a school.  The school was about ten miles from where I lived. I was in great 1of money and wanted to do something useful, so I2.
    Three days later, a letter arrived.  It asked me to meet the principal of the school at Croydon. It proved to be a(n)3journey -a train to Croydon station, a ten-minute bus ride and then a walk of4a quarter of a mile.
    A man who was short and round seemed to be the principal and he opened the door for me. "The school," he said, "has a group of twenty-four boys between seven and thirteen years old." According to the man, I should have to teach all the subjects5art, which the man himself taught. I should have to6the class into three groups and teach them at three different levels, and I was not glad at the7of teaching Maths -a subject which I wasn't good at. It was8that I had to teach them on Saturday afternoon because most of my friends would be9themselves at that time.
    Before I had time to ask about my10,the man got up to his feet. "Now," he said,“You'd better meet my wife.  She is the one who really runs this school.”

小华学习了有关声音的知识后，对材料的隔音性能很感兴趣，于是他设计了如下实验进行探究，请阅读并回答下列问题．实验步骤：

①先搜集各种材料，如衣服、报纸、平装书、塑料袋、袜子；

②把闹钟放到一个鞋盒里，将衣服盖在鞋盒上方，然后逐渐远离盒子直到听不见滴答声，记下此时人离盒子的距离；

③分别将各种材料盖在鞋盒上方，重复以上实验，得到下表的数据：

回答问题：

人体呼出的气体中二氧化碳量增多，增多的二氧化碳产生于（  ）

轨道倾角是指地球公转轨道面与其它行星公转轨道面的夹角．偏心率是椭圆焦点到中心的距离与椭圆半长轴之比，它决定椭圆的形状．如图为“行星绕日轨道倾角与偏心率曲线图”，读图回答下题．