从Ⅱ栏中选出Ⅰ栏中句子的正确答语

Ⅰ

① Who's this?                                        

② Are those your cousins?                    

③ Is that your photo?                            

④Where does your mother work?        

⑤ Is he a doctor？                                 

Ⅱ

a. She works in a police station. 

b. No, they are my friends.

c. Yes, he is.

d. No, it isn't.

e. It is my mum.