选出你所听到的句子。(12分)
(　　)（1）A.Where is my ruler?                B．Where is my book?
(　　)（2）A.It's on the desk.                 B．It's under the chair.
(　　)（3）A.No problem.                        B．Here you are.
(　　)（4）A.Are you Li Ping?                   B．Where are you?