题目

选择合适的选项补全对话。 A. go to school B. Good morning C. orange D. Nice to meet you Mike: Good morning, Sarah.Sarah: , Mike.Mike: Sarah, this is John.Sarah: .John: Nice to meet you, too.Sarah: I have a new(新的)bag.John: It's .Sarah: Yes. It's beautiful (漂亮的).Mike: Let's .John& Sarah: OK! 答案：【1】B【2】D【3】C【4】A3．如图，DE∥BC，EF∥AB，AD=15，DB=9，FC=12，求BF．