答案(点此获取答案解析)
1.7,2,\u5982\u56fe\u6240\u793a\uff1aA\u3001C\u3001B\u5206\u522b\u8868\u793a\u4eba\u7684\u5934\u9876\u3001\u773c\u775b\u548c\u811a\u7684\u4f4d\u7f6e\uff0eEF\u4e3a\u5e73\u9762\u955c\u4f4d\u7f6e\uff0c\u7531\u5e73\u9762\u955c\u6210\u50cf\u7279\u70b9\u53