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材料一、北京人遗址坍塌过半:2003年12月2日,中科院地质与地球物理研究所牟会宠教授说:“1929年裴先生发现北京人头盖骨时,山顶洞是完整的,而现在有一半多已经露天了。一进洞,很明显地就会看到山顶洞的内顶板、南侧壁的岩石有大量松散的堆积体,遇到稍微剧烈的震动,很容易就塌方。”

材料二、2003年中科院公布了对周口店遗址地质病害调查结果:周口店遗址目前面临全面危机。地震、爆破和火车震动的影响,造成岩石从较陡的斜坡滑落,产生塌方。遗址旁边采石厂的爆破作业,对遗址保护非常不利,周围水泥厂的粉尘容易形成酸雨,侵蚀岩石。过量的开发也使得坡度过大或者洞顶过薄,致使洞顶塌方、斜坡滑落。

材料三、《北京晚报》(2004-05-21)报道:文物保护专家在对北京人遗址存在隐患的各个地点进行了多次勘察的基础上,目前已经制定出抢险方案,预计今年下半年将正式启动抢险加固工程。                                                                                                                               ——摘自中学历史在线

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    When US teenager Jake Olson isn't playing football or golf for his high school, he's often offering inspiration(灵感)through his new book about his own life.

    These activities might be too much for the average 16-year-old to deal with, but Jake is blind. When people ask him how he can possibly play golf without being able to see the ball, he says he is thankful for his father's guidance.

It seems apparent that his early experience playing sports as a person with sight and muscle(肌肉) memory— repeating behaviors over and over until they become second nature — have also enabled Jake to hit the ball quite well.

    Jake was born with a rare kind of eye cancer that took away the vision from his left eye when he was a baby and eventually his right eye, in 2009, when he was 12 years old. Rather than letting the disease hold him back, Jake used his loss of sight and his faith as sources of motivation(动力).“If I was going to sit on the couch all day, feeling sorry for myself, I wasn't going to do anything. I decided that I was going to go out and persevere (坚持不懈).” he said.

    It was with that mind-set that the student from Orange Lutheran High School in California was able to write his first book, Open Your Eyes: 10 Uncommon Lessons to Discover a Happier Life. “It's about opening the readers' eyes to their true talent in life and making sure that they use all the abilities that they have,” Jake said.

    Jake's father, Brian Olson, said the family is impressed with what he has done with his life, including showing people that they can get through hardships. “Your darkest hour can soon become your brightest, and with every setback, there's a setup,” Jake said. “In every one of us, there's more potential than we can ever imagine, and it really is a choice.”