IV．短文理解：（共4小题，计10分）
G：Good evening，Mum．
M：Good evening，Betty．
G：Look，Mum！What's this？
M：It's a cake．
G：Yes，it's a nice cake．It's for you．
M：For me？
G：Yes．Happy birthday to you．
M：Thank you．
G：How old are you，Mum ？
M：I'm 35．
根据对话内容回答下列问题。
1．Whose birthday is it today？________________________________________
2．Is she very happy？ __________________________________________
3．Is Betty's mother very old？________________________________________
4．How old is Betty's mother？ ________________________________________
