秦朝短期而亡的主要原因是（   ）

根据短文理解，从A、B、C三个选项中选择最佳答案填空。

    I was flying to New York at night. Suddenly, a storm broke and the plane began to be tossed（颠簸）around.

    When I looked 1 the plane, I could see that nearly all the passengers were worried and afraid. The future seemed terrible and many were 2 if they would make it through the storm.

    Then, I 3 saw a little girl. It seemed that the storm meant 4 to her. She sat on her seat reading a book. Sometimes she closed her eyes, then she would read again, with no 5 or fear in her eyes. When the other passengers were scared (惊恐的) half to death, that child was completely calm and 6 I couldn't believe my eyes.

    When the plane finally reached New York, I was not surprised to 7 that all the passengers were hurrying to come out. I stopped and spoke to the girl whom l had 8 for such a lone time.  I asked 9 she had not been afraid.

    The child replied, "My daddy is the 10, and he is taking me home."