1．阅读下面的程序：importjsondemo_dict={"city":"北京","name":"小明"}print(json.dumps(demo_dict,ensure_ascii=False))运行程序，程序最终输出的结果为（）。A、{"city":"北京","name":"小明"}B、{"city":"\u5317\u4eac","name":"\u5c0f\u660e"}C、{}D、运行错误