题目

过n边形的一个顶点的对角线可以把n边形分成______个三角形．（用含n的式子表示）   答案： 阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。【1】For many older people, driving is important for preserving their ___________( independent).【2】I owe an _________( apologize) to you because I have failed to accompany you to the bookstore.【3】The elevator doors slid open, and a couple, ______ (dress) in elegant coats, appeared with shopping bags.【4】You go ahead, and I’ll catch up on some sports news while _______( wait).【5】To be brief, great changes _______( take) place in our school over the past three years.【6】The naughty child ought to be punished. You couldn’t have him_____(behave) rudely to the elderly.【7】After wandering in the forest, we found ourselves _____ (lose) in a strange path.【8】It was not until last year _____ they informed the public of the serious problem.【9】She has written many articles, some of _____are intended for students poor in English.【10】In fact, tradition also refer ____ the things that have been developing and that are still being created.