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In page Literacy:

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The Chinese government conducts standardized testing to assess proficiency in Standard Chinese, known as Putonghua, but this is primarily for foreigners or those needing to demonstrate professional proficiency in the Beijing dialect. While literacy in Chinese can be assessed by reading comprehension tests, just as in other languages, historically, literacy has often been judged by the number of Chinese characters introduced during the speaker's schooling, with a few thousand considered the minimum for practical literacy.[citation needed]