题目

Once many years ago, I pulled a family out of a burning car somewhere in Wyoming. Last week I ______ a telephone call from a woman who could not stop ______ as she told me that one of my stories had saved her son from committing suicide. In closing she called me a ______.That ______ me thinking about what a hero is. Was I a hero because I pulled a family from a burning car? If so, ______ could I be a hero just because I ______ a story that saved someone's life?Today I decided to look up the word “hero” in the dictionary to see ______ what it meant. It ______ “a person who does something 在日常生活中，与化学反应速度有关的做法是（　　）A．用热水溶解蔗糖以加速溶解B．把块状煤碾成粉末状再燃烧C．真空包装食品，以延长保质期D．低温冷藏使食品延缓变质