听力原文：

B: Mom, I want to get a motorcycle. Is that all right with you?  

F: You mean a murder cycle? Did you know more cyclists die in accidents than racing drivers?  

B: Mom! I’ll wear a helmet and I’ll drive carefully. I promise.  

F: I’ll tell you what. You can get a motorcycle on one condition.  

B: What’s that?  

F: You must spend four weeks in your dad’s ambulance company as a volunteer. 

B: And after that?   

F: After that, we’ll let you decide if you still want a murder, I mean motorcycle. 

Question: What is the condition that the son can buy a motorcycle?

参考答案：

He must spend four weeks in his dad’s ambulance company as a volunteer.