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.
