阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。
A
Winnie is usually found sitting on a windowsill（窗台） in its master’s bedroom, fast asleep .One March night, she saved her master’s life.
That day, the Keeslings borrowed a gas-powered water pump for the basement of their home to pump out water after a flood. By nightfall, outside temperatures were below freezing, so every window in the house was closed except Winnie’s.
Cathy Keesling turned off the gas pump, and by the time she went to bed, at midnight, her husband, Eric, was
