今天收到uscis的信，说是要补充材料：需要父母在中国的房产证明及在美国的经济来源证明。原文如下：
evidence to establish that you have a residence abroad to which you intend to return.
Please documentary evidence that you have the ability to financially maintain yourself throughout the duration of your stay.
现在父母都在美国，国内的房产证没有随身携带，有没有其他变通的办法？关于在美的经济来源，能否用我的银行存款证明？谢谢。