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CAMBRIDGE – A teenager is being hailed as a hero for saving his aunt from a fire at their house, but he lost his own life when he went back into the burning building to search for the family’s two cats, authorities say.     Seth A. DeShane, 14, pronounced dead late Thursday at the family home, which was destroyed in the fire.    “He really saved his aunt,” said the Rev. Kris Dietzen, pastor（牧师）at Cambridge Lutheran church. “He woke his aunt up and told her the Christmas tree was on fire.”   “He got her out of the house. She thought he （Seth） was behind4．如图所示的四个实例中，在改变物体内能的方式上与其他三个实例不同的是（　　）A．烧煮食物B．锯条发烫C．屁股“冒烟”D．搓手取暖