题目

根据句意及所给汉语提示完成单词。 81. It must be great to feel the beauty of _________ (自然) on a clear autumn afternoon. 82. My father and I had a ___________ (严肃的) talk about my study last night. 83. The weather report says the temperature will be ___________ (低) than today. 84. Do you know how long it has been in            (使用、服务)? 85. 一I think winter is a beautiful season, _________ (尤其)when it snows. —Me, too.等边三角形的对称轴是 _________ ，有________条对称轴.