When she learned that she broke the world record, she felt an irresistible______to cry at the winner's stand.
【正确答案】 D
【答案解析】各项的意思是：courtesy谦恭有礼(by courtesy按惯例；礼貌上)；demonstrate说明，演示；bravery勇敢；impulse刺激，推动力。根据句意判断，答案为D。