题目

（本题满分4分）（1）如图①两个正方形的边长均为3，求三角形DBF的面积.（2）如图②，正方形ABCD的边长为3，正方形CEFG的边长为1, 求三角形DBF的面积. （3）如图③，正方形ABCD的边长为a，正方形CEFG的边长为，求三角形DBF的面积. 从上面计算中你能得到什么结论. 结论是：（没写结论也不扣分） 答案：解：（1）        ………………………（2分）  （2）…………（2分）结论是：三角形DBF的面积的大小只与a有关，与无关.（没写结论也不扣分）解析:略 阅读下面对话, 从方框内7个选项中选择5个恰当的句子完成此对话。A. I think Sound Lake is the best.B. How do you like Qinghai?C. We’ve been to many wonderful places.D. How long have you stayed there?E. How did you go there?F. But I think riding camels is the most exciting one.G. Where have you been?Linda: Hi, Bruce! I haven’t seen you for a long time.     小题1:Bruce: I’ve been to Qinghai with my parents.Linda:     小题2:Bruce: For two weeks.Linda:     小题3:Bruce: It’s one of the most beautiful provinces in the northwest of China. I like it very much.Linda: Which is your favorite place?Bruce:     小题4:   When I was there, I lost myself in the beautiful city.Linda: What interesting things did you do there?Bruce: Lots of things, such as swimming, boating, fishing.      小题5:Linda: Oh, really? I hope to go there for a visit one day.