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是不是：

1。需要 give up the green card in 北京領館, and then apply for the B2 visa(visisor( to enter U？
-It is the best way.

2。give up the green card in 北京領館需要多長時間？
-Immediately. 

能在放棄綠卡的同時申請B2visa嗎？

-Yes. of course. You need to follow the B-2 visa application instructions to make an appointment and provide the application documents.

謝謝。急等您的回答