My father sold everything we owned, took all the money and disappeared from our lives. My mother suddenly found herself 21 to care for five boys. I worried about the situation, but my mother stayed
阅读理解 Mr Jackson is having a meeting. He looks at the clock on the wall. It is 7:45. “The last bus left fifteen minutes ago,” he thinks. “I’ll have to stay in a hotel tonight.
、右图是中国古代利用水力提高生产效率的一项装置示意图，