题目

 (江西省南昌二中2009届高三5月模拟考试B篇) It was the end of my first day as a waitress in a busy New York restaurant. My cap had gone away, and my feet hurt. The loaded plates I carried seemed to be heavier and heavier. Tired and discouraged, I didn’t seem able to do anything right. As I made out a check for a family with several children who had changed their ice-cream order a dozen times, I was ready to stop. Then the father smiled at me as he handed me my tip. “Well done,” he said, “you’ve looked after us really well.” Suddenly my tiredness disappeared. I2．下列关于组成细胞的元素及化合物等的说法，正确的是（　　）A．淀粉、蔗糖和糖原均由葡萄糖脱水缩合而成B．肽键的断裂、ATP 的合成均有水的参与C．DNA 的特异性与碱基的排列顺序、空间结构有关D．活细胞中含量占据前三位的元素是O、C、H