根据所给的情景选择合适的表达。
1.当你想知道“她是谁”时，你说[ ]
A. Is this she?
B. Who is he?
C. Who is she?
2.当别人问你，“这是你爷爷吗？”，你可以回答： [ ]
A. Is this your grandfather?
B. Yes, he is.
C. No. she isn't.
3.你想看一看对方的家庭照片，你说：[ ]
A. Is this your family photo?
B. Can I have a look at your family photo?
C. Yes, it is.
4.你猜测她是对方的妈妈时，你会说：[ ]
A. She's your mother, I think.
B. Is she your mother?
C. She's not your mother.
5.当你不确定这是不是对方的爸爸时 [ ]
A. This is your father.
B. Is this your father?
B. He is your father.