()5. —Who's that girl?—____A. She's my sister.B. He's my teacher.C. He's my father.

A。解析问句询问“那个女孩是谁”，答句应回答女孩的身份，并且用she来指代女孩，A项意为“她是我的妹妹(姐姐)”，B项意为“他是我的老师”，C项意为“他是我的爸爸”。故选A。

二、为下列句子选择合适的答语。
()1. Who are they?
()2. Who is this tall man?
()3. Whose toy car is this?
()4. Whom do you see at the party?
()5. Who is that woman?
A. She is my mother.
B. It's Sarah's.
C. He is my uncle.
D. Li Lei.
E. They're my teachers.

1.E 2.C 3.B 4.D 5.A

三、同学们在玩抢椅子的游戏。 请把他们抢到的椅子填在横线上。
1. —____ is my English book?—On the desk.

2. —____ is that boy?—He is my cousin.

3. —____ can we help?—We can plant new trees.

4. —____ coat is this?—It's Linda's.

5. —____ are these?—They are boats.
A. What B. Where C. Who D. How E. Whose

1.B 2.C 3.D 4.E 5.A

四、从括号中选择合适的单词,补全句子。
1. —She is old. She is my mother's mother. Who is she?—She is ____ (Grandma/Mum).
2. —She and I have the same mother. ____ (Whose/Who) is she?—She is my sister.
3. —I call him Dad. Who is he?—He is my ____ (grandfather/father).
4. —I see a red book. ____ (Whose/Who) book is it?—It's my sister's.
5. —He is young. He and I have the same father. Who is he?—He is my ____ (brother/grandpa).

1.Grandma 2.Who 3.father 4.Whose 5.brother。
4.解析根据答语“她是我妹妹的”可知，问句询问“这本书是谁的”，询问物品的所属关系用whose提问。