题目

When other nine-year-old kids were playing games, she was working at a petrol station. When other teens were studying or going out, she struggled to find a place to sleep on the street. But she overcame these terrible setbacks (挫折) to win a highly competitive scholarship and gain entry to Harvard University. And her amazing story has inspired a movie, “Homeless to Harvard: The Liz Murray Story”, shown in late April.Liz Murray, a 22-year-old American girl, has been writing a real-life story of willpower and determination. Liz grew up in the shadow of two drug-addicted parents. There was20．19世纪20年代，德国物理学家欧姆对电流跟电阻和电压之间的关系进行了大量实验探究，从而发现了“导体中的电流跟导体两端的电压成正比，跟导体的电阻成反比”这一规律．人们为了纪念他在电学中的成就，用他的名字来命名电阻单位．