从右栏中选出与左栏相应的答句。

①Is this your school?____                                                            A.There are three.

②How is your brother, Tom?____                                                B.I'm a student.

③Is there an art room in your school?____                                 C. She's Jack's sister.

④What are you?____                                                                    D. Yes, it is.

⑤How old is he?____                                                                    E. No, there aren't.

⑥Is Mrs. Li a teacher?____                                                            F. Thank you very much.

⑦Are there five boxes on the desk?____                                    G. He's fine.

⑧How many rubbers are there in th edesk?____                       H. Yes, there is.

⑨Sit down, please.____                                                                I. No, she isn't.

⑩Who's she?____                                                                       J. He's twelve.

将Rt△ABC绕点A逆时针旋转90°得到△ADF，BC的延长线交DF于点E，连接BD．已知BC=2EF．求证：△BEF≌△BED．

一只雌猫一次产了三只小猫，这三只小猫在毛色上不完全相同，则说明物体具有（  ）