阅读下列短文，掌握其大意，然后从每题所给的四个选项（A、B、C和D）中选出一个能填入空格的最佳答案。

    It's the day before Christmas. Karen Hartley, 33, was skiing（滑雪）by 1 at Powder Mountain in Utah. By mistake, she began to ski off the trail. Soon she 2. She shouted for help, but no one heard her. Night came, and the temperature 3 below freezing（凝冻）. Karen was very cold and afraid of 4. But she stayed calm. She played music in her mind and danced all night long to stay 5. She danced to old disco songs, pop songs, and Christmas songs. “It was either dance 6 die,” she said. “I kept on 7. I didn't give up.”

    The next morning, a helicopter began to 8 Karen. After 18 hours in the cold, she was 9 just before it's too late. Karen was very cold but all right. She 10 Christmas Day in a hot tub（浴缸）.