我看北京AR邮件上要求如果寄资料用EMS,应该不是必须,最好是用EMS,你看下面这段话If you have sent us an EMS or other registered mail and would like confirmation that it has arrived you must contact your postal service. Our office is unable to provide confirmation for each document delivered.我刚翻出来看那应该是其他的快递也能接受。所以不用担心。只是从准备资料开始对CIC写的每一句话能奉为神明,小心翼翼,怕出错。所以根据要求比较保险。