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    Clara Barton，founder of the American Red Cross，gained worldwide honor for her dedication to easing human suffering and earned the nickname  “Angel of the Battlefield.”

    Barton was born into a liberal (开明的) freethinking family in 1821. Her elder brothers and sisters happily tutored her in math and reading, so when she entered school at three years old, she could read and spell three-syllable words. ____

    Concerned about Barton's difficulty in making friends, her parents sent her to a boarding school, hoping it would make her more comfortable with her peers. ____ Barton lost her appetite and cried constantly. After only one term, she had to be brought home. Then, Barton stayed out of school to nurse her older brother through a serious injury and also volunteered to care for poor families during a smallpox (天花）outbreak.

    In 1861，the Civil War broke out. The sight of wounded soldiers touched Barton deeply. She began to collect and distribute food, bandages, medicines, and other supplies for the Union army.

    ____ There, with little concern for her own safety, she cooked meals, assisted surgeons, and comforted wounded soldiers.

    Eventually，because of working too hard，Barton collapsed，ill with typhoid fever (伤寒症). ____ It was there that she learned of an organization based in Switzerland — called the International Red Cross, whose work mirrored her own.

    Shortly after Barton arrived back home in 1873，her sister died. ____ When recuperating (休养）at a health facility in New York，she began planning for the establishment of an American wing of the International Red Cross. Although at first the government resisted，her efforts finally paid off. The American Red Cross was officially organized on May 21, 1881. Her influence lives on today in the work of the organization she founded.

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2015年3月28日，是西藏自治区百万农奴解放56周年纪念日。56年来，自治区开创了跨越式发展和长治久安的新局面。西藏实现跨越式发展的原因有（）