扩展对话?你是需要更多的问题＋答案嘛?：（问题）Compared to children growing up in the city and in the countryside where childrengrow up What's the difference?（答案）Children growing up in the city hav...恩恩，就是以这个问题为中心对话说三到四句就可以了那我这个可以吗。