题目

在△ABC中，AB=3，BC=4，AC=2，D，E，F分别为AB，BC，AC中点，连接DF，FE，则四边形DBEF的周长是（）A. 5 B. 7 C. 9 D. 11 答案：【答案】B【解析】试题解析：∵D、E、F分别为AB、BC、AC中点，∴DF=BC=2，DF∥BC，EF=AB=，EF∥AB，∴四边形DBEF为平行四边形，∴四边形DBEF的周长=2（DF+EF）=2×（2+）=7．故选B．Fill in the blanks with the given words（选词填空） Where　　What time　　What　　Whose (1)I like to fly a kite. ________ do you like to do? (2)He likes swimming in the pool. ________ does he like swimming? (3)Susie gets up at 7:00 every morning? ________ does Susie get up every morning? (4)Sam's hobby is playing soccer. ________ hobby is playing soccer?