题目

_______that he was in great danger, Eric walked deeper into the forest. A. Not realized            B. Not to realize   C. Not realizing          D. Not to have realized 答案：C 解析: 略在北方的冬季，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”