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    Those who believe that they will never do well in a particular area probably never will. Those who believe they are not good at1will forever feel unprepared. But those who believe that it is2to succeed at what they attempt can surprise themselves.
    Adam was ready to3.His wife Anna, however, was less4.As she explained to a friend, "Adam has5done anything that required physical strength. When he retires, he will sit in his easy chair and6me to bring him his food.”
    But to Anna's7, soon after her husband retired, he8a health club. Arriving home from exercise class one night, he announced,  "I9for the wrestling tournament. I am going to10Friday night.”Anna was shocked. "Please don't do it, Adam. You're not in11.You will be so beat up that they will have to carry you home!”12,he couldn't be persuaded and she told him that if he wanted really to do it, she was not going to watch.
    13to her word, she stayed away as Adam wrestled. And just as she14, two men carried Adam home. He15down on the bed, every muscle pained and wounded.16she could speak, he cried out," Don't say a(n)17, Anna! This is not the worst of it. I18tonight. I have to wrestle again tomorrow night!”
    Nothing 19in your life until you believe you can do things that are important to you. And if you have a low20of yourself, nobody else is likely to raise it.

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斯塔夫里阿诺斯在《全球通史》中写道：“旧制度所显示的破产导致旧制度的变革。第一个变革是解放农奴……这是俄国历史上的一个重大转折点……工厂工人的数目从1865年的381000人上升到1890年的1620000人……”材料显示这次改革（　　）

Mary is tired of learning because she is_____ to do better than she can, both at school and at home.

20世纪90年代，德国通过补贴推广向日葵生产，以提高食用油的产量。短短的两年之内，向日葵种植面积显著扩大。由此可以看出，在德国的这种成功案例中，起最重要作用的因素是