题目

      If I were writing a history of my family, some of the darkest moments recorded would be those about Christmas trees. One would certainly think otherwise; selecting and putting up our trees have always been filled with risk. For example, one afternoon dangerously close to Christmas Eve my mother bought what she thought to be a bargain, a glorious tree that was so full and tall that we could hardly get it into the house. Once we did, my father immediately realized that we would have to hire a carpenter（木匠） to build a stand for it. Another December, perhaps the very next one, w下列各句属于哪种句式？在括号内回答并按要求改句子。 白杨树是西北极普通的一种树，然而它实在是不平凡的一种树。（　　） 改为感叹句：_____________________________________