The main subject of Second Language Acquisition Critical Period Hypothesis, second language acquisition theory and language of Krashen monitoring mode, articulation theory theory based on the combination of theory and practice, using theory to guide practice.

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This topic mainly results in two language customs the critical period hypothesis, the second language custom results in the theory with the gram Raschen's language monitoring pattern, the curriculum engagement theory rationale, unifies the theory and the practice, instructs the practice with the the

This issue mainly the critical period hypothesis in second language acquisition, second language acquisition theory and the theory of krashen's language-monitor mode, course of convergence theory, combining theory and practice, using theory to guide practice.

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