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From 1999 to 2003 Li was a part-time student at the Graduate School of the Chinese Academy of Social Sciences , where he studied Administration of Agricultural Economy and obtained a doctoral degree .
 Chinese Academy of Social Sciences
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chinese Academy of Social Sciences