对话理解：
（1）A.America          B.Canada                    C.Australia
（2）A.Noodles          B.Dumplings                 C.Rice
（3）A.He is a postman.  B.He is a shop assistant.    C.He is a policeman.
（4）A.Six yuan         B.Two yuan                  C.Four yuan
（5）A.John             B.Kate                      C.Mary