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http://www.uscis.gov/forms/citizenship-and-naturalization-based-forms/document-checklist-form-n-400-application-naturalization

http://www.uscis.gov/citizenship/learners/study-test
http://www.uscis.gov/citizenship/quiz/learners/study-test/study-materials-civics-test/naturalization-self-test-1

Google "父母申请绿卡" and you find a lot of information.

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• Thanks a lot! -redwest- ♀ (0 bytes) () 12/07/2014 postreply 21:34:23