听对话，回答各小题。
【小题1】Bob wants to be a doctor because ________.

A．his mom asks him to do that

B．he is interested in Chinese medicine

C．he thinks doctors are very cool

【小题2】Who can teach Bob something about Chinese medicine?

A．His grandparents.

B．His grandfather and father.

C．His parents.

【小题3】What does Ann want to be?

A．A soccer player.

B．A pianist.

C．A movie star.

【小题4】Ann spends ________ practicing playing the piano every day.

A．2 hours

B．half an hour

C．one and half an hour