兄弟姐妹互相帮助，可以说：________
A．Father and mother help each other. B．Brother and sister help each other.
C．Let's help each other.
妈妈向好友介绍说：“这是我儿子”，她可以说：________
A．This is my daughter. B．This is my son.
C．This is my brother.
你想知道高伟的弟弟多大了，你应该怎么问呢？________
A．Who's that boy? B．How is your brother?
C．How old is your brother?
我爱我的爸爸妈妈，可以说：________
A．I love my mother. B．I love my father.
C．I love my father and mother.
你向爸爸介绍Miss Liu的时候可以说：________
A．Hello，Miss Liu. B．This is my teacher，Miss Liu.
C．She's my teacher，Miss Liu.