题目

等腰三角形的边长分别为6和8，则周长为___________________． 答案：【答案】20或22【解析】由于题中没有指明哪边是底哪边是腰，则应该分两种情况进行分析．①6是腰长时，三角形的三边分别为6、6、8，能组成三角形，周长=6+6+8=20，②6是底边长时，三角形的三边分别为6、8、8，能组成三角形，周长=6+8+8=22，综上所述，这个等腰三角形的周长是20或22，故答案为：20或22Paris is the capial of France. Its subway is very special. You can enjoy its culture when you are in this city. First you see many people reading books in the subway. Whenever they are in the subway or at the station, there is always a book in the hand. The subway station in Paris is not big , but each of them has its special facts. Some stations looks ships. Some have clothes, caps and shoes. And every station has a big advertisement picture. But many of them are for selling clothes and cosmetics(化妆品). You can meet some beggars(乞丐) in the subway. But the beggars in the Paris subway are also very special. They often play the violin or guitar in the train. They don’t feel shy at all. Instead they think it is natural. After playing, they will go around the train and ask you to give them some money. If you want to learn more about Paris, go to the subway and enjoy its culture by yourself1.What do many people usually do when they are in the subway?A.Listen to musicB.Beg some moneyC.Sell clothes and cosmeticsD.Read books2.How do the beggars get money from people in the subway?A.They often play the violin or guitar in the trainB.They usually brush shoes for the passengersC.They often steal money from the shopsD.They usually help the passengers carry suitcases3.Which of the following is true?A.Every station is very big in ParisB.Every station has something to sellC.The beggars in the Paris subway station are very shyD.The beggars in the Paris subway station can play some instruments4.What’s the main idea of this passage?A.Reading in the Paris subwayB.The subway is the window of the Paris cultureC.The beggars in the Paris subway station usually have some skillsD.Each of the subway station in the Paris has its special facts