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8老师,您好。

我这次回美入海关时，出示了绿卡，但是又被叫到一个办公室问了我本科学的专业，我的电邮和电话。我不知到啥原因我被问这些问题。我能想到唯一一个理由时我去年和今年都回国，但是每次回去都超不过一个月。
-Probably that is not the reason because your visiting China once a year for a very short time (about one month each) is very normal. Technically, the IO has the right to check you like that though they normally do not do it to a green card holder very often. I don't think it is a serious thing. Most likely, it is a random selection of check.

我担心下次回国回来时是否还会受这种待遇，或者更麻烦？
-Don't think so.