阅读对话，回答问题。

A: Excuse me, who's that man, Xiaohua?    

B: He's my father.

A: Is that woman your mother?            

B: No, she isn't. She's my aunt, Miss Liu.

A: Where's your Mum?                  

B: Look! She's in the car.

A: Oh,I see.   

1. Where's Xiaohua's Mum?

2. Who's that man?

3. Is Miss Liu Xiaohua's Mum?

下列关于胆汁的描述，哪些是正确的（）

A.胆盐是血红蛋白的代谢产物

B.肠对胆盐的重吸收导致胆汁进一步分泌

C.脂肪的消化吸收需要一定浓度的胆盐

D.NaCl自胆囊的主动转移出去是胆汁在胆囊内借以浓缩的机制

E.胆汁内含有脂肪酶