题目

At the 1924 Olympic Games in Paris，the sport of canoe (划船) racing 61.________(add) to the list of international competition. As the time for the Olympics neared，it became clear that Bill's wife would give birth to their first child when the US. canoe team would be competing 62.________ the Paris games. Bill was one member of that team and he found 63.________ in a dilemma. Should he go to Paris and risk not being at his wife's side when their baby was born? 64.________ should he withdraw from the team and remain with his family? Finally he decided to remain home，where he cou在北方的冬季，常见的几种物态变化现象中，属于凝华的是（　　）A．室外冻冰的衣服变干B．房间窗户玻璃的内表面出现冰花C．湖面结了厚厚的一层冰D．正在跑步的人，口中呼出“白气”